Strange phenomena when use function

Hi, there
I developed a function to return a string. However, if I return the function value after the line below, it always comes out as “#Value!” in the location I am calling it. Any suggestions?

Function FindString() as String
Selection.Find(What:=LatNow, After:=ActiveCell, LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False).Activate
FindString="MyString"
END Function

Thanks in advance.

Regards,
Lily