How to on being able to race these tracks?

I feel like I'm about to ask a really dumb question here, but I have looked around and can't see anything related.

I downloaded the All tracks torrent, installed them using the mod manager. All good so far.

Now how do I actually race on any of the tracks in single player?

 

Select all tracks and all cars at the top of the Series screen.

 

I knew it, dumb question, thanks so much for your help!

 

you can also create a vMOD so only a certain mod, or choice of mods is allowed on track at one time. This also allows you to set other parameters. But the All tracks all cars is the easiest method.