Hi richardballard20,

We appreciate you posting questions here.

@Regina_Lend_A_Hand_Accounting has the idea. You can manually edit the memo field and enter the account number from there if you're printing the copy of the check. 

On the other hand, if you want the checks to be processed by the bank, you'll need to use the pre-printed voucher check. You can get it directly from your bank or order checks from us. Just go to this article to get our phone number: Order Checks, Tax Forms, and Other Supplies. 

Post your comments below if you have any questions.