Make a table with panel logins to user ID's?

I know the title wasn't clear, so this is my scenario:

I made an admin panel for my game where you fight zombie bosses, but I want to make a bunch of whitelists. Each whitelist has a different login, and if you use a certain login, it will check for that person's ID.

Can anyone explain how I would do this?

Use DataStores to check for a key and a value.

You can learn about DataStores on the wiki page.