do you mean the oven door handle?
I have the same make oven, and when my kids broke the oven handle (after using it as support when they climbed up on the kitchen unit!!) my boyfriend undone the two screws at the top and top screws at the bottom of the door, but CAREFUL COS THE FRONT DOOR GLASS WILL EASILY FALL OFF, so hold the glass, gentley move it out of the way! On the back of the glass door you will see 2 more screws, undo these and replace the handle (or just tighten the screws back up if the handle isn’t actually broken) then put it back together again!

We had to use slightly bigger screws as the thread had gone.

throw it away and get a new one

heat resistant blue tak