Hello @Missmyjud,
Welcome to the Community Forums! Managing your account online through myAT&T is wonderful. I would be happy to help you with this.
We have a great article on primary and secondary account access. If you are unable to see the drop-down towards the top with the other users listed your account may be categorized as secondary. The article will show you how to change this; however, you will need the current primary to make the change.
I hope this information helps! If you have any further questions please feel free to reach back out by replying in this thread. Have a nice weekend!
Jessica, AT&T Community Specialist