From the Website

To mark sections:

#1 Log in to BillionGraves.

#2 Click View My Profile (main menu).

#3 Scroll down to My Cemeteries and click on the name of the cemetery you are working on. 

#4 Click the + or - button upper right hand corner) to zoom in on the cemetery.

#5 Right click inside the cemetery to mark sections that need headstone pictures.

#6 The Needs Photo* icon will appear, marking the selected section. 

#7 Drag the Needs Photo icon to adjust its location (if necessary). -Changes are already saved. 

#8 To remove the Photo Icon left click and choose delete section

* Needs photo icon 

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Step 4

Steps 5 - 7

Step 8