You will need the Full Write Accounting permission to perform this action. If your account has more than one organization, each organization numbers its own checks and uses its own check templates, and bills from two organizations cannot be paid together.
To pay a bill with a printed check, record the payment with Check as the method and add it to the print queue. Then print it from the queue.
Record the payment as a check
Go to Accounting > Payables in the left-hand menu.
Find the bill you want to pay. Click the 3-dots menu
at the start of its row and choose Record payment.
In the Record Payment window, choose Check in the Method drop-down.
Check Print? beside the bill. This adds the payment to the print queue under Accounting > Print Checks.
Click Post, then Continue, to save the payment.
Print the check
Go to Accounting > Print Checks in the left-hand menu.
Find the check you just created and click Print on its row.
Check the Starting Check # and choose the right Check Template, then click Preview and Print.
For every print setting, see How do I print checks from the queue?.