How to Set Up MetaMask: A Beginner Step-by-Step Guide

MetaMask is the most widely used self-custody wallet for accessing DeFi. It is a browser extension and mobile app that lets you store crypto, connect to decentralised applications (dApps), and sign transactions yourself. This guide walks you through setting it up safely, step by step, with no prior experience needed.

Risk warning: DeFi is experimental and unregulated in most jurisdictions. You are your own bank. Nobody can recover your funds if you lose your recovery phrase or approve a malicious transaction. Never invest more than you can afford to lose.

What is MetaMask?

MetaMask is a non-custodial wallet, which means you (and only you) hold the keys. There is no company that can reset your password or reverse a transaction. It supports Ethereum and other EVM-compatible networks such as Polygon, Arbitrum, Base and Optimism, which is where most beginner-friendly DeFi activity happens.

Think of it as two things bundled together:

• A wallet that holds your tokens and shows your balances.
• A login that connects you to dApps like Uniswap, Aave or OpenSea, letting them request transactions you must manually approve.

Step 1: Install the official extension

The single biggest risk for beginners is installing a fake MetaMask. Fake extensions and apps are designed to steal your recovery phrase the moment you type it.

1. Go directly to the official site by typing metamask.io into your browser yourself. Do not click links from emails, ads, social media or search results.
2. Choose your browser (Chrome, Firefox, Brave or Edge) or download the mobile app from the official App Store / Google Play listing.
3. Confirm the extension publisher is "MetaMask" and check the install count is in the millions before adding it.

Step 2: Create a new wallet

When you first open MetaMask, choose Create a new wallet.

1. Set a strong password. This password only unlocks the app on this device. It is not a backup of your funds.
2. MetaMask will show you a Secret Recovery Phrase (also called a seed phrase): 12 random words.

This phrase is the master key to everything. Anyone who has it controls all your money.

Step 3: Back up your recovery phrase the right way

This is the most important step in the entire guide.

• Write the 12 words on paper, in order. Do not screenshot it. Do not save it in a notes app, email, or cloud storage. Malware specifically scans for seed phrases.
• Store the paper somewhere private and fireproof if possible. Many people make two copies kept in separate locations.
• MetaMask will ask you to confirm a few of the words to prove you saved them. Complete this honestly.

Golden rule: no legitimate service, support agent, or website will ever ask for your recovery phrase. Anyone who does is trying to rob you.

Step 4: Fund your wallet

To do anything on Ethereum you need ETH to pay transaction fees (called "gas"). To buy ETH:

1. Buy ETH on a reputable, regulated exchange (in the UK this typically means an FCA-registered provider).
2. Copy your MetaMask address by clicking your account name at the top (it starts with 0x).
3. Withdraw a small test amount first. Always send a tiny amount on a new route before sending the full amount.

Gas fees on Ethereum mainnet can be high for beginners. Consider a low-fee network like Base, Arbitrum or Polygon to learn with smaller amounts.

Step 5: Add other networks (optional)

MetaMask ships with Ethereum mainnet. To use cheaper networks, you can add them via Settings, or use the network selector which now suggests popular networks automatically. Always verify network details against the official documentation of that network, never from a random pop-up.

Step 6: Connect to your first dApp

1. Visit a well-known dApp such as app.uniswap.org (type it yourself).
2. Click Connect Wallet and choose MetaMask.
3. MetaMask pops up asking you to approve the connection. Connecting is free and just shares your public address.
4. When you make a real action (a swap, a deposit), MetaMask shows a transaction with a gas fee. Read it before approving.

Common beginner mistakes to avoid

• Approving unlimited token allowances without understanding them. Revoke unused approvals periodically using a tool like revoke.cash.
• Signing blind. If a website asks you to sign a message you do not understand, reject it.
• Reusing the recovery phrase on suspicious sites pretending to "validate" or "sync" your wallet. This is the number-one scam.
• Sending tokens on the wrong network. Funds sent to the right address on the wrong chain can be very hard to recover.

Frequently asked questions

Is MetaMask free? Yes. You only pay network gas fees, which go to the blockchain, not MetaMask.

Can MetaMask be hacked? The software itself is well audited, but users get compromised by fake sites, malicious approvals, and leaked seed phrases. Security is mostly down to your habits.

What if I lose my phone or computer? As long as you have your 12-word recovery phrase, you can restore your wallet on any device. Without it, the funds are gone permanently.

Next steps

Once your wallet is set up and funded with a small test amount, the natural next step is making your first token swap. See our guide on How to Use Uniswap to put your new wallet to work safely.