MetaMask Setup Guide (Educational)

By Bram de Vries — Amsterdam-based crypto educator (6 years). Published: Feb 24, 2026

Last reviewed: Jul 30, 2026

TL;DR

  • Install MetaMask only via metamask.io and your browser’s official store page.
  • Back up the 12‑word seed on paper/steel; never screenshots or cloud notes.
  • Add networks from official docs; avoid copy‑pasted RPCs from random sites.
  • Limit approvals, use transaction previews, and review/revoke monthly.
  • For larger balances, pair a hardware wallet so keys never touch your computer.

1) Install from the official source

Go to metamask.io and follow the link to your browser’s store (Chrome, Firefox, Edge). Verify the publisher and reviews. Avoid sponsored search ads; type the URL directly.

2) Create a new wallet

Set a strong local password. This encrypts your vault on the device; it does not replace the seed phrase. If someone knows your seed, they can restore the wallet anywhere.

3) Back up your seed phrase

Write the 12 words on paper or steel. Store offline. Do not store photos or cloud notes; do not enter the seed into websites or forms. No legitimate team will ask for it.

4) Add a network (Polygon/Arbitrum/Base)

Open Settings → Networks → Add Network. Copy RPC details (name, RPC URL, chain ID, currency, explorer) only from official docs. Bookmark explorers like Etherscan, Arbiscan, and Basescan.

5) Safer approvals and signing

  • Prefer transaction previews/simulations when available.
  • Limit token approvals to what you need, not unlimited.
  • Review allowances monthly and revoke stale ones.
  • Check the contract on the explorer (source verified? proxies? owner privileges?).

6) Pair with hardware (optional, recommended)

For larger balances, connect a Ledger/Trezor so private keys never touch your computer or phone. You’ll sign transactions on the device itself.

7) Troubleshooting tips

  • Network not showing? Re‑add from official docs and restart the browser.
  • Nonce or stuck tx? Use Speed Up/Cancel or set a custom nonce with care.
  • Unknown token? Add by contract address from the official site/explorer.

Next step: Practice on an L2 with tiny amounts to learn gas, explorers, and approvals before trying more advanced dApps.