Does anyone know how to make tokens inside wallet become visible to the wallet balance?

Inside several of my wallets, there are tokens which I received from airdrops, quests, and other Web3 activities that are not included or recognized by my actual wallet. These assets do appear on the Blockchain so I know that they are valid. Has anyone else experienced this & will someone give directions to claim these already held tokens? I am including a Screenshot for example, but this is a good activity for Builders & Developers to learn.
Let’s claim our tokens!! (NFT’s are another example)

just find their contract address on the blockchain and add them on your wallet