For your reference
You may add user if you are using QBO Essentials or Plus
Welcome to the community family! QuickBooks offers you the flexibility to add new users as well as changing your credentials when needed. I want to make sure you have everything you need to complete your task.
The first article shared by @Fiat Lux - ASIA provides the step-by-step procedure to add, delete, or change user access. If you're interested in updating your current user info, here's how: Change your email, user ID, or password for QuickBooks Online, QuickBooks Online Accountant, and Qui...
You may also find these other articles useful.
I hope this helps! Feel free to stop by if you need anything else.