User overwhelmed by technical details in resolving issue (ref#MRDRGQ)

[AceRimmer (Smoke me a kipper, I'll be back for breakfast!)]

ATT used to be fairly easy to set up.
Now this guide is for a different ATT BGW router but it might help move you forward.

Helpful guide to set up Port Forwarding for AT&T BGW210 router - Support / ARC: Port Forwarding Resources - Roon Labs Community