Radio Shack seems to have removed information from its manual on the BTX-127. But here is what they have removed. Viva la Revolucion!

• Open the radio's battery compartment.
• Use a paperclip, pen, or something similar to change the settings of the DIP switches. UP (towards the antenna) is ON, or 1, DOWN is OFF, or 0. The leftmost switch, as you look at the DIP switches, is switch 1.
• set switch 1 OFF.
• chart of frequencies:
  

  switch 2-6 settings	Frequency (MHz)	channel name	MURS legal
  00000	151.625	Red	No
  00100	151.700	Olive *	No
  00101	151.760	Salmon *	No
  00110	151.820	Lavender *
  Yes
  00111	151.880	Cyan *	Yes
  01000	151.940	HotPink *	Yes
  00001	151.955	Purple	No
  00010	154.570	Blue	Yes
  00011	154.600	Green	Yes

  * = these didn't have official color names, so I gave them my own.

• The radio can be programmed with other frequencies "by your authorized Radio Shack service center". Maybe someone will figure out how to DIY.
• Sometimes the radio will act strange when you try to set the frequency, beeping, the LED blinking or going out. Just keep trying.
• unlisted channels go to 154.600. these are probably what can be programmed by the "service center".