How To Install Apps
Installing applications on your T-Mobile myTouch 3G is very simple. If you have or had a previous Android Handset then you’ll be very familiar with the steps.
In order to install applications that are currently on the Android Market onto your myTouch. Just find the Market icon and click it. Find the application you desire in the Android Market and proceed to install it.
To install myTouch applications that are not listed in the Android market you need to go to your phones settings. Choose applications and make sure you have checked Accept Unknown Sources.
Click the link or select the .apk file you are installing to your myTouch.
And you’re finished! Simple aint it?