You're unable to add another user to QuickBooks Self-Employed (QBSE), becky. Let me explain further.
QuickBooks Self-Employed (QBSE) supports only two users: you as the primary owner and an accountant. With that, you're unable to add another user for a bookkeeper.
You'll want to upgrade to QuickBooks Online to add more users and access advanced accounting features. Follow this article for steps to switch, export data, and cancel your current QuickBooks Self-Employed subscription to prevent double charges.
Additionally, here are some articles for more insights on QuickBooks Self-Employed and accessing a client's QuickBooks company file: