How do you add a client to quickbooks self-employed?

Hello there, userparnaztaheripr.

We're unable to keep a record of your clients, customers, or vendors in QuickBooks Self-Employed. However, you can add a customer when creating an invoice and you can enter your client's name in the Description or Notes field when creating a transaction. 

For more details on how QuickBooks Self-Employed works, you can use this article: QuickBooks Self-Employed Overview.

Let me know if you have other questions. Take care and have a great day!