You can find the function in character section, by clicking on the eye icon.
You can create a search by category :
-Hunt
-Istances
-Events
-Battlefields
-Others(?)
For each category you can choose a subcategory:
-Hunt which mob if you choose hunt group research
-Go into which istance if you choose to search group for istances
-The event you want to search a group for, if you choose events
-And other stuff, if you choose others
You can also add requests for group research
At first look this function seems pretty good, but, due to the fact that we are not that many active in the game and almost all active player know each other, it is useless