ok here we go.
if you followed the instructions on the XDA link http://tiny.cc/batch659
you should have several things done including:
moto device drivers
USB Debugging mode enabled on your phone
Enviromental variables set(not really needed for this, but it doesnt hurt)
what I use and I find easier to explain to people for installing *.apk's is Droid Explorer's Batch installer.
so(and this may differ) you will want to start up Droid explorer. On 64-bit win 7 ultimate i have to start it with my phone unplugged so it does not get stuck on starting ADB server protocols.
this is the window that will pop up. Connect your phone and hit refresh.
and then connect. This will put you lookin at the file structure for the phone, all we are concerned with at this time is installing an apk. So look at the upper toolbar icons for batch install.
once in there it will ask you to select your apk from whatever folder you saved it to on your computer.
After you choose the one you want its pretty easy from there if you have ever installed software before.
Hope that helps. Enjoy