To change this element the oven has to be taken out of the housing.
A suitable table or stand allows you to slide the oven out of the housing (if it's mounted high) without lifting too much.
Isolate the power to the appliance first, then take it out.
The following is from the service manual.
a) Remove the left hand side panel
b) Disconnect the wiring and remove the 2 screws securing the element to the base element tray.
(It may be necessary to pull down the base element tray to gain access to the left hand screw.)
c) Remove the element by sliding it out of the base element tray.
d) Reassemble in reverse order ensuring that the termination insulation is fitted and the base element tray is pushed up in place.
Reassemble, refit in place.
Restore the power and set the clock.
Your oven should now be up and running again.
Hope this helps
Let me know if you need more help.