Adding a new admin user in QuickBooks Online (QBO) is pretty easy. Please refer to these steps on how:
In QBO, go to the Gear icon at the top right to get to the Manage Users.
Tick Add user and choose Admin as a user type.
Enter the name and email address in the desired field, then hit Save.
An email will be sent to the new user. Have him/her select the “Let’s go!” link in the email, which takes them to a sign in or account creation page. They need to sign in or enter info to create a new account.