How to add kraken's API key to hive wallet?

Hello.
this is my first time mining, sorry if question is too newbie.
When configuring a wallet, on examples, you only add the coin, the address, a name, a source, and that’s it, but for kraken, the wallet also asks for an API key.
I generated it, only with deposit permmission, but then I don’t know what to do. The form is a select field instead of an input one, so I can’t write my key, and the select’s empty, with no options.
Is it bad if I just leave the field empty?
How do si add the key to my wallet?