Hello, @mark310
Currently, the feature to add an employee to a contact list to QuickBooks Self-Employed (QBSE) is unavailable.
QBSE is designed for self-employed individuals track their business-related transactions. We'll track your National Insurance contributions, work-from-home deductions, and mileage in QBSE.
For more information on how we can help with your account, see this article: Three tax calculations to help you at tax time.
Let me know if there's anything else that I can help. I'm always here to assist. Have a great rest of the day!