If they want to share exp. (Which most people usually do).
But if they are nice and say they don't need it
you don't have to.
;D
Go to Glast Heim in "Dungeons".
Don't go inside! Go left, then go north into the dungeon.
Then when you're inside, to to the right side of the map, you should see a red dot which is the entrance to the Chruchyard Dungeon.