The element is situated at the bottom of the drum. Take photo of the wiring before disconnecting it.
Just uncouple the wires attached to the thermostat. Usually block connector.
Undo this nut which is attached to the retaining clip, with a spanner or a socket. Don’t undo it all the way because you have to tap the nut in, to release the pressure on the seal, then with a flat bade screw driver prise the washing machine heater element away from the outer tube. Be careful with this
The thermostat is a push fit into the element
If you need to check if the element has blown you will need to use a multi-meter to test it.
Replace which part is need and reverse this procedure