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.
You are connected to OpenSea (your wallet and account icon appears in the platform menu). To start buying NFTs, tap Explore.
Select All NFTs or choose the category you are interested in.
You can select different filters by clicking on the search filter.
After selecting filters, close the filter window and select a desired NFT by tapping on it. A new window will appear with full information about the token. To buy, press Add to cart, and to bid, tap Make offer.
If you want to buy the NFT now at the price displayed, tap Add to cart.
Then confirm your shopping cart’s content.
Now, you have to confirm the NFT purchase in your Tangem Wallet.
Tap Sign and Send to confirm your purchase.
To view your NFT in your OpenSea profile, click on the three dots in the upper-right corner and select Account.
Tap Profile to see your purchased NFT in your NFT collection.
Following the same principle, you can buy NFT tokens from other NFT marketplaces and dApps supporting NFT trading.