Extension:
Visit MagicEden from your browser.
Click on Connect Wallet in the top right corner.
For Solana and Polygon, select “Phantom”.
For Ethereum, select “MetaMask”.
You are now connected to MagicEden and free to make bids, purchase NFTs, or list your NFTs for sale!
Mobile:
If you are on mobile you will need to visit magiceden.io in the in-app browser.
You should receive a pop-up to connect automatically, if not don't worry, click on the three lines in the top left and then click on Connect wallet
A pop-up will then have you sign a message to verify your wallet and you are set!
Now you can switch freely between Solana, Ethereum, and Polygon.
Note: You will only be prompted with the "Sign Message" screen on the first time visiting MagicEden.
You are now connected to MagicEden and free to make bids, purchase NFTs, or list your NFTs for sale!