How to Join Shed roof to Gable end

[zeyeam]

I have a gable end of the house and I want the roof over the deck to join the gable on the sides (same on other side of deck). I am not sure the right terminology, but I have attached a screen cap to show what I have now. In the red oval I want the gable roof plane to extend out to the corner. I don't know if you call this a hip or a shed. The roof over the deck is what I am after where it meets the gable end.

I have tried using the plane join function and could not get the desired results.

Can someone point me in the right direction?

Thanks, Dave