Search on YouTube. You should find enough general info on replacing washing machine door rubbers to get yourself by. It's usually a springgy circular clip that you have to take off ( without damaging the rubber), checking the rubber and if it is OK, reseating it, replacing it if not, then replacing the clip (without damaging the rubber)
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix washing machines.