In AntiX, I want to add a user account, but can't find muser (MEPIS User Assistant, which I would have used in SimplyMEPIS) or anything similar. What program should I use? I need a graphical program, not command-line.

try "adduser".

EDIT: I didn't see the part about not being command line (but what's wrong about it?).

What's wrong with a command-line program? I'll try it, but I can't guarantee I'll figure it out. Look at my LQ name.

adduser is a pretty straight-forward program, it will ask for any relevant information with sane defaults if you use it.
Regarding your name, it will never change if you don't try, but maybe sometime you can ask Jeremy to change it into gurusforever if you do.

OK, I'll at least try adduser. No, no, you misunderstand: I mean my name should probably signify that I'm the sort of user who would rather not use a command line and wouldn't necessarily figure it out. (Although it actually was intended as a jab at LQ users who are rude to me when I ask a question or say something that might be stupid, ignorant, or newbie-ish. I had more trouble with them back in 2006 when I made this account.) I have no serious interest in changing it, especially since I'd have to distract Jeremy from his work.)

Just type in the "adduser" command with no arguments, and it will guide you through all the steps.

antiX control centre has under System tab - Add User. It is the antiX (rough) equivalent to Muser.

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OK, I'll look again. There were a very large number of items in the menus, so I must have overlooked it.