On their home page, click on "signup". (Or, if you're like me, you will already be logged in to the DFA site and can skip this part.) That will take you to a page with two options. You can sign up via FaceBook (which is a little easier) on the left side, or just sign in on the right side of the page. Signing in requires your name, email address and a password you make up.
When signed in, put your mouse pointer over the “Endorsements” tab on the upper left. That will cause a dropdown box to appear. Click on the second box (Current Applicants). That will take you to a page with all the candidates seeking endorsement. You will see “Thicke for Agriculture.”