If you have created the memorials recently, then they will not show up as a hint. That databases is refreshed fairly frequently, but new memorials do not appear immediately.
You create a source for the FindAGrave memorial in the same manner that you do for any external source.
It is essential to remember that links to the FindAGrave database are CASE SENSITIVE.
The link to any memorial ishttp://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=xx...
with the xxxxxxx being replaced by the memorial number of the individual.
To link a source citation to a fact
Click Sources, then click the Links tab.
Click Add a new Source link . The Link To dialog box opens.
Type the name of the person to locate the person in the list.
Select the fact you want to link the source to.
When you have finished, click OK. The person and fact (if you linked to a fact) are displayed in the Links list. The link is designated with a fact icon.