BillionGraves website:

#1 Log in to BillionGraves.

#2 Hover over Research (main menu).

#3 Click My Photo Requests.

#4 Requests I Have Accepted box: Click the plus  icon (bottom box).

#5 BillionGraves Photo Requests page: at the bottom of the cemetery list, click Show my requests and/or Show requests I accepted.