Okay, I think I found what was wrong. Evidently the directions are totally incorrect. Here are the correct ones in the latest version on Debian 11:
Open program
See left panel
Look for down arrow icon and select it
At bottom of list is “Add Account+”, and select it.
This is just a simply layout problem, but the keyboard shortcut, Ctrl-J, can help here. The movement between windows and settings and other parts are a little bit of a mishmash, but it can be easily fixed with a little tweaking.
Now to find out if it will work with my service provider to handle text messaging.
I tried something similar before and found that Jami doesn’t support regular SMS since it’s focused on internet-based messaging. You’d still need your phone’s regular app for texts.
With Jami, you usually need to add your VoIP account under the “Accounts” settings and make sure SMS/MMS is enabled if the provider supports it. Make sure the domain, username, and password are entered correctly. I tested something similar using bulk sms for a small project, and it worked perfectly once the credentials and server settings were right, so double-checking those usually fixes most issues with receiving messages on desktop.