ParaSwap does not list individual tokens by itself but relies on token lists to show the default tokens. Token lists are lists of ERC20 tokens curated and verified by members of the DeFi ecosystem.
In order to check the default token lists ParaSwap uses, refer to the Token Lists menu located in the three dots on the top right of https://app.paraswap.io/.
In order to get your token listed in ParaSwap, you should add it to any of the default token lists that are currently used.
If your token is not present in these lists and you still want to trade, please read the article on how to add custom tokens. However, make sure to also consider the potential risks of using custom tokens, as ParaSwap has no way of verifying their safety.