smtp shows imap and cannot change-pc freezes

I am using windows 11 home and comcast as a server.
I installed emclient and I can receive email but not send. It is stuck in outbox.
In account settings, I noticed that the SMTP is set to imap.comcast.net.
When I attempt to change and save, the PC locks up, have to reboot.
I can change the word comcast or the word net and save but not imap.