In the interests of teaching a man to fish rather than giving a man a fish...
This is the BTB forum, not a GTR Evo forum, and it is the age of the Internet, so visit http://google.com and type adding a track to GTR Evo into the search box and you'll find the information in the first few choices. If you're really confused, there are even some videos in the first 5 results of the search.