If you are looking to add the NFT manually, there is a big chance you bought a SeleCT x StormX NFT! AWESOME!!
Adding the NFT to your MetaMask is easy. Follow these steps to make them visible in your wallet:
Navigate to MetaMask (Mobile). Under the Swap icon in MetaMask, you will see "NFT's". Click this button.
You will now see a list with your current NFT's (if you already have an NFT). On the bottom, you will see + ADD NFT's. Click this button.
Now you need to fill in the Address and the ID (this is the number of the NFT)
ID: (Check your transaction on Etherscan, you will find the ID there).
After filling this in the correct way, you should see the NFT's as shown in the image below.