Changing tire size on my tuner

[smokinsrt]

I purchased an Edge Evolution a couple years back and I was never able to get my tire size to save on it. I switched to the Gryphon and put on my order form what tire size I was running it came back with the proper size on it. I bought some new rims and tires for the winter and they are smaller once again I go in to make my change and when I get back into it it hasn't saved. Whats the deal? Anybody ever had this problem am i not doing something right, a certain step to save the change or what?