You can email the author, Julien Vanier, directly.
I created this app because I have a car with an internet-connected navigation system, but the app released by the manufacturer was so bad that it was unusable. So I decided to create an alternative.
Send To Car makes my life easier in a small way. I hope it will do the same for you.
I created Send To Car in my spare time, but if you have a question or an issue I will do my best to help you use the app.