How To Write A Check Back Side . For example, you should write $122.51 as. If you get approval, endorse the back of the check by signing it. How to Write a Check A StepbyStep Guide from www.earncheese.com When you write a check, the only place you need to sign is on the front—right on the signature line. This signals to the bank that you are endorsing the transfer of ownership for the check. Create a check mark symbol by pressing and holding alt, and then typing 0252 using the numeric keypad on the right side of the keyboard.