How do i program frequencies into my uniden bearcat scanner bc350a

The BC350C is a factory pre-programmed scanner, so you cannot program it in the standard manner - entering frequencies via the keyboard. You can, however, transfer a displayed frequency from the SCAN or SEARCH mode into the PRIVATE bank. Details for doing this are in the factory manual that you can download and print, at no cost, here:
http://www.uniden.com/pdf/BC350Com.pdf

For a comprehensive database of active frequencies in your area, and a lot of other useful scanning information, visit:
www.RadioReference.com

Bill B.
Listening in since the 60's