pull the oven out.remove the back panel.disconnect grill element wiring making a note where they go back.undo the 2 nuts holding the element to oven cavity.pull element out from inside the cooker cavity.you might find 2 screws to remove from the roof of the oven cavity to allow the grill element to be removed.fit in reverse
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix electric cookers.