Go to KEMS System Administration Menu -> KEMS Parameters -> KEMS KeyNet Parameters (KE0715) -> Employee Portal Parameters (KE0956) -> More Parameters (KE1230) -> 'Paystub Printing Logo URL'.
**NOTE: If you already have an image you want to use on the checks, you can save it on the Web Server under KeyNet/Custom/images folder. From here Keystone can go in and change the link for you.**