Turn off your oven and open the door. Notice the metal latch resting above each hinge on the oven door.
Insert your flat-head screwdriver under the latch and pop it up. This unlocks the hinge. Repeat with the other hinge.
Close the oven door. Lift the door up by the handle and pull it out to remove it.
Place the oven door face down on a work surface. You now have full access to the hinges.
Tighten the screws on the hinges using your screwdriver. This will fix any loose door hinge. If the hinge is damaged beyond repair, remove the screws and hinge completely and replace with a new hinge.
Fit the oven door back on the oven frame so that the hinges lock into place.
Open the oven door and flip the metal latches down over the hinges to lock the hinges.