Guild Wars 2

Stating that my account had been stolen. However my browser will not open the link in it, which is likely a good thing as I can still play my game.
I have attached a screen shot of the e mail.
NanaEdie5093

What is “Mumble” is it a tool that allows in game chat if so where do I find it, I’d like to be able to talk with my group wile playing, I find typing difficult while plsaying. Lord of the Rings has a lovely in game chave sytem that I find invaluable, I’m disappointed tha one isn’t include with this game.