Hey @watchingdawn!
I’m not sure I understand what you’re trying to do.
Managers can only manage others’ accounts, you can’t set yourself as the manager of your own account, and you can’t set yourself as the manager of someone else’s account.
Once you copied your manager ID, you’re supposed to share it with the person who’s account you’re going to manage, and they have to add you as a manager by pasting your manager ID.