If you open your Google Map
and you are trying to tap the
My Location.
But then, you are seeing this information.
Please enable a My Location source in system settings.
And you don't know where to configure that settings.
It's simple.
Go to your Settings then
tap the
Location and securitytap the
Use wireless networksand last, tap the
Agree. 
if you don't have a WiFi connection,
you can't still see your
My Location and you will see this notification
another option you can use is your GPS
check the
Use GPS satellites
Now, go back to the Google Map application to check if it is now working.