How to find a group using musonza/groups package

Im trying to use musonza/groups so i can build a group system on my app any idea how can i find a group so I can use request function that we have in the package? I tryed this but it's not working code:

use Groups;
use Auth;
public function makerequest($id){

        $userId=Auth::User()->id;


        $group->request($userId);

        return redirect()->back()->withMessage('request done!');


    }

I get Undefined variable: group error because I don't know what is the function to find my group using the facade nb: I get $id from the form

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