Thank you for taking the time to visit the Community. I'd be glad to help you with authorizing another person to access your QBO account.
There are just a few steps to add a new user in QBO. Here's how:
1. Click the Gear icon in the top right corner.
2. Select Manage Users.
3. Choose Add user in the top right corner.
4. Decide which type of user you'd like for them to be.
I've got an article for you that offers details on adding, deleting, and changing a user's access. You can check it out here: https://quickbooks.intuit.com/community/Account-management/How-to-add-delete-or-change-a-user-s-acce....
Another write-up I believe you'll find helpful goes over the different user types and permissions that can be set. This link will take you right to it: https://quickbooks.intuit.com/community/Account-management/Understanding-user-types-and-permissions/....
With this information you'll be able to give another person access to your account. Keep up the great work and please let me know if you have any other questions.