GNS430 Problem Creating Flight Plans

Not sure if this problem is just me or if it is an old problem - but I am having an awful time trying to figure out how to enter a flight plan route in the GNS430 in any of the Carenado aircraft.

Now I must add that I have not used a GNS430 for a couple years as my default GPS is the GTN750. But I wanted to start using it just to keep my knowledge up for this GPS.

My other thought was whether this problem has anything to do with the latest P3D v4.3 which is what I am using.

My basic problem is that I cannot seem to get the entries into the GPS - example: CZBB - WC - HUH - KBLI

I have read the manual and I have even checked out YouTube but when I try to do what is indicated the buttons/knobs just do not seem to function.