[SOLVED] How do I enable API access?

So I was working on a global leaderboard and when I did a solo test this error message appeared in my output:

15:22:15.160 - 403: Cannot write to DataStore from studio if API access is not enabled.

When you click on the message it brings you to my Global leaderboard script. It then brings me to this line:

    CashODS:SetAsync(Player.Name, Player.leaderstats.Bucks.Value)

Note: My currency is set to "Bucks" so that why it isn't cash.

Beyond that point, I am stuck and don't know how and what to do to fix this error message. How do I enable API access?