If you don't have a BillionGraves account:
#1 Goto https://billiongraves.com/
#2 Type First Name (optional) and Last Name (required) in the Find Their Graves form.
#3 Click Start your search.
BG search page.
FYI: You need a BillionGraves account to edit records.
If you have a BillionGraves account:
#1 Log in to BG.
#2 Click Search BillionGraves (upper right hand corner).
#3 Click People Search (left side).
#4 Fill in Last Name (required field), and optional fields as appropriate.
#5 Click Search.
To many results? Add first name, dates and/or locations.
No results? Broaden search by removing the first name, dates and/or locations.