Welcome aboard ecrib. To check your signal strength, press the Voom button, and then follow the screen insructions and press the colored buttons to go to System settings, and then Installation settings. You can scroll through the installation settings by pressing the up and down buttons. Keep in mind that the signal strength settings that you will see ONLY pertain to the channel you were viewing whn you entered the installation settings menu. To check signal strength on another channel, you have to back out--change the channel, and then go back to installation settings.
Give it a try, because this is also where you determine what version of the software you have, and whether or not your phone hookup is working.