changing wing mirror problem

hi bought a new wing mirror but i cant get the cover off that bolts on the outside of the door tried searching but no luck shame thought it was going to be easy !

It is fixed from the inside, no need to remove anything from the outside. Look at the new one and you will see the fixings.
Replaced the powerfold on my wife's 2006 model earlier this year and it took only minutes.

Clear & concise instructions in the manual, worth buying if you don't already have one.