Took the two srews out from the inside, on right and left. Loosed the two hex srews athe top.
Stuck the small flap of gasket in the slots on the oven.Then pressed the sloted part of the gasket around the edge on the oven with my finger, untill it was even all around. You may have to seperate the lip from the base a little with a srewdriver to give it some room for the gasket to set in slots behind lip.