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Hi and welcome to the forum.
Im sure its the same on the modus as most other cars, so here goes.
There should be a little plastic cover (normally trianlgle shaped) on the inside of the door where the mirror joins the car. You need to take this off, there might be a screw with a cover that you need to take out before pulling said cover off.
Once that is off this will reveal probably 2 or 3 largeish bolts / screws. Undo these and whats left of the mirror will come loose. If the mirrors are electric then you will probs need to undo the connector plug for this as well.
fitting the new one is the reverse of the above.
Hope that helps.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo