Replace side mirror

Hello!
I live in Norway in Europe and I've just bought a Chevy Tahoe 2003 5,3 LT. The side mirror(glass) on the passenger side is broken and I've just received a new one. This one seems to have buildt in turn signal.
Is it possible to get the signals to work on my Tahoe as I don't have this sort of mirror now?
My second question is, and the most important, what is the trick to losen the mirror glass?

Hope anyone could answer my questions?

Bobbe
Norway

Just about every power mirror I've messed with is attached with a snap in ball/cup type of fastener. I've always just been able to pull on the edge of the mirror and it unsnaps right off the fasteners, and just pops back in for reassembly. Please note that I've done this on a lot of other GM cars, but not the Tahoe. I don't see it being any different though. If anyone else can chime in and correct me if I'm wrong, please do so.

Your correct JKM, the one on my 03 actually fell out on the driver's side.