Track Mania Nations Servers
Main Gaming servers
Server 1 is FP custom maps, Server 2 is Nascar, Server 3 is F1, Server 4 is Rally
To add to favourites cut/paste this to the ingame explorer at the top of the page. ( Move your mouse up to the top of the screen )
It does not tell you if it has taken, you have to look in your favourites.
Just clicking the link and launching the game may work too.