Google Sheets Connector - where do I add the information?

My apologies if this is not in the correct category.

I have started making my first workflow, starting with a Google Sheets reader - I saw that I need to add a Google Sheets Connector before that, so I have done. I’m about to follow the instructions on the Oauth stuff, but when it gives me an API key or whatever else - I cannot see where in the Google Sheets Connector node that information would be added. It doesn’t have a ‘configure’ option like the other nodes.