Hello @JulieP436 ,
Every account login - regardless of permission level - needs a unique username to login. When you're added as a new user on an account, the email address used to add you is the default username of that new login. Therefore, if you plan to be on multiple accounts, you'd need to change your username to something unique after being logging in the first time.
If you need further assistance with updating an older / unused account's username to something other than your email address, I'd advise calling general support to provide the email address in question, confirm security permissions live, and work with the agent to administratively update that other username.
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If you're working through a partner / affiliate setup, you should be able to have that level of management / access over all your child accounts, depending on your setup. If you're a partner and need further assistance with this, I'd advise reaching out to Partner support via the provided email address or phone number.
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