I have a radio Shack digital scanner cat. No#2000652 Pro-652. I can not understand how to enter frequencies and when I do enter a frequency I can not make it proceed to channel #2 to enter another frequency; I need your help to solve this problem. I have gone to 3 Radio Shacks in my area (Phoenix Arizona) and no one knows how to help me program the scanner.Dr. Ronald Capello thejew7@cox.net Thanks for the help