Hello @Asumlin,
Welcome to the Community Forums! Using myAT&T is a great way to manage your account, I’m sorry to hear you are having issues logging in. I would be happy to help you with this today.
Recently there where some issues with logging in on Internet Explorer, please try logging in using another browser. You may also need to delete the history and cookies. Please use the below links on how to do so.
To recover your username or password please visit our login page and pick the appropriate link. Let us know if you have any further issues by replying in this thread.
I hope you have an amazing weekend!
Jessica, AT&T Community Specialist