First, make sure you device button you are using is configured to be
a "VCR" device. By default the VCR button is configured to be a "VCR"
device. If you are using something like AUX button, you need to first
configure that button to be a "VCR" device rather than Home Automation
device.
See Page 19 in the 15-2117 manual labeled "Reassigning the device keys"
http://support.radioshack.com/suppor...oc70/70607.pdf
Second assuming your button is configured for the correct device, assign
the *device* code to the button using the procedure on Page 9 of your
15-2117 manual labeled "Programming a device"
http://support.radioshack.com/suppor...oc70/70607.pdf
Verify the Power button works for your device.
Finally, to assign "Input" function to the TV/Video button use the
instructions on page 15 of your manual labeled "Using keymover"
http://support.radioshack.com/suppor...oc70/70607.pdf
Based on what you are telling me, you found the "advanced codes"
for your VCR device and it says advanced code 215 is for the "Input"
function.
In step 4, you should press the VCR button.
In step 5, you should press "P" (the green P button in top left)
followed by 215
In step 6, you should press the VCR button
In step 7, you should press TV/Video button
Again, I'm assuming you are using VCR button for your device. If you
are using something else, modify the instructions appropriately.