My NAV system wont let me input a destination for guidance.

Hello, the first concern I would suggest is that if you have not updated the Maps of your system, seven years is a very long time to be using an older set of mats. I would recommend upgrading by visiting: https://hondanavi.navigation.com You can purchase the upgrade there and then install it in your system. This may resolve concerns. Other than that, you'll have to refer to your owners guide to get all the information on how to operate and navigate the system and maps as designed. If the system Is not responding to input commands, then there could be a hardware problem - which is not serviceable by anyone but automotive audio repair professionals.