There is a glass cover over the lamp. Can you advise how to remove the glass cover so that the lamp can be replaced.
Is it to unscrew, pull out, twist and turn. ?
If it's round you unscrew anticlockwise - a damp rag helps to grip. If it's rectangular it's held in by spring clips - a large flat bladed screwdriver will easily prise it out - the galss is thick so don't worry over much about damaging it.