Do you have a recent reference within the last year? That'll work too!
First things first, make sure you're on the Credentials page. Then click, 'Request Reference'
Scroll down to the bottom of the pop out, then click on the Upload Completed Reference Form button.
Enter in all the information for the required fields. When you're done, be sure save by clicking 'Add'
To cancel any changes you've made, simply click the left arrow in the top bar. You will be prompted "You have unsaved changes. Are you sure you want to leave without saving?" Just click 'OK' and your changes will not save.