Open https://opensea.io, click on the three dots in the upper-right corner, and press Connect wallet.
Tap WalletConnect.
Tap Connect on the screen that appears.
Open the Tangem app and press Start.
Return to OpenSea to tap Accept and sign.
Go back to Tangem app and press Sign.
You are connected. You can now buy, sell, and create NFTs on OpenSea
To complete your session, go to the settings page on Opensea and tap My Wallet. On the screen that appears, click My Wallet again and Log out.