I don't even get to that point.
I tap on the next arrow option at the bottom when opened K-9, then I add my email address and password.
Press next and get Invalid Setup:Null, nothing more no other options then the back at the bottom of the screen...
I have tried auto, and manual setup and get the same Invalid Setup:Null after I tap on Setup POP3 on the page that says: "What type of account is this?".