Thanks for reaching out to the Community page, @644124741ab-gmai. I'd be glad to provide you some info about sending e-checks.
In QuickBooks Self-Employed, the option to write or send e-checks is unavailable. You can enter expense transactions only. The money will come out from the bank account you selected or attached to it.
Here's how:
- Go to the Transactions menu.
- Choose Add transaction.
- Enter the transaction's details, then categorize it.
- Lastly, select Save.

You can also check this article on how to classify transactions: Categorize transactions in QuickBooks Self-Employed.
Additionally, I've attached a link to help you accept electronic checks in QuickBooks. It will guide and provide some insights on how does an eCheck payment work.
If you have additional questions, you can always get back to this thread. I'll be around to assist you again. Keep safe and have a good one.