Getting supercross and Nationals beta tracks working

[kawirider95 (A)]

I was wondering if anyone could help me figure out how to get my supercross and national beta tracks working they never show up the only ones that do are the free ride

[JamieT (A)]

http://bruceatkinson.com/dirttwister/smf/index.php/topic,4543.0.html

First post.  Last 2 links.