To re-print a check, you will need to toggle a checkbox within the account register.
In order to do that, follow these steps:
1) Navigate to the Chart of Accounts:
2) Click on the name of the account that you need to print the check from:
3) Find the record that needs to be re-printed and select the checkbox:
4) Now if you navigate back to the "Print Checks" page, you should be able to follow the usual process: