How do you program a Radio Shack Triple Trunking PRO-2055 scanner?

To program a Radio Shack Triple Trunking PRO-2055 scanner, first, turn on the scanner and press the "MANUAL" button to select a channel. Then, use the numeric keypad to enter the desired frequency or trunking system. For trunking, press the "TRUNK" button and input the appropriate trunking frequencies and settings. Finally, store your settings by pressing the "E" (Enter) button, and scan by pressing the "SCAN" button to listen to the programmed channels.