Be aware, when using Proconnect, you can see different behaviors with different browsers.

I'm doing a 990 return, using Chrome (latest version) on Windows 11.   If you go to the page to add a non-profit board member, there is no "+" to the right of the existing members, to add a new one.

If you login with Edge, the "+" sign appears.

Its a real shame Intuit doesn't thoroughly test their product on Google Chrome, one of the most widely used browsers out there.   I think a weakness in their development process.