Can I delete one customer that I have put in twice

Yes, delete the one with no transactions

Hi there @usergeorge-randecker,

Thanks for checking in with the Community. Rustler is correct, you can delete or inactivate the customer that has no transactions, Follow these steps:

1. Go to Sales, 
2. Then Customers.
3. Locate the customer and in the Action column choose Make inactive.
4. Select Yes to confirm the request.

You also have the option to merge the two customers, here is a great article with steps to do so: Manage customer lists

I’m happy to help with any other questions about customers or anything else. Feel free to ask anytime.