Add a SHA fingerprint - Help request! (please and thank you)

[Adam Shinehoft]

Hello,

We are trying to Add a SHA fingerprint to our Firebase App.

Below are some screenshots.  

Sadly, I'm stuck on Authenticating Your Client (photo below).

Second.  I think KeyTool is the way to go, but i'm not sure how to move forward.

Any help is greatly apprecaited.

Thank you,

Adam