You can add 1 accountant to your QuickBooks Self-Employed account. Let me guide you on how to do it.
Here's how:
Go to the Gear icon.
Choose an Accountant.
Enter the accountant's email address in the field.
Click Send invite.
A confirmation that the invitation was sent will appear.
Select Done.
Once completed, your accountant will receive an email invitation. You can read through this help article for more insights about the benefits of letting your accountant manage your account: QBSE Benefits for accountants and their clients.
Also, you can check these articles to help you get acquainted with QuickBooks: