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Depends on the project itself.
You should check coin providers like (Coinmarketcap) and find some information like Contract for token/coin/asset you want to add. If you can get information like Solana, Ethereum, ETC have a token contracts for Terra Blockchain.
Then you can add the token with manual input in the wallet, just like Add new token in Metamask :
https://www.altcoinbuzz.io/bitcoin-and-crypto-guide/how-to-use-the-terra-station-wallet/But, I check CMC a token you are ask. Can't find any contract address in Terra Blockchain, so can't support I guess.