Railworks America

I recently installed the CBQ Big Horn route but idk how to use it or find iit in railworks plz help

I don't know your level of experience with Railworks. If you're new to the game: from the main menu of Railworks choose 'drive' and then play around with the options there. Look for the new route, choose a scenario to run (probably freeroam). You can't hurt anything by just trying things out - go for it. That's the way you'll learn.

I know how to use routes download from steam but this was freeware it was 2 rwp files which I installed via package manager

Assuming the two rwp files installed correctly, the route should show up on your routes list for driving or editing, just like any other. I guess you may have to 'clear cache.' Do that by selecting 'settings' from the main menu, then 'tools.'

If you are trying to run the route in quick drive mode, you can't because it doesn't have any quick drive scenarios. The route includes several free roams to play, and you can always make your own quick drive scenarios.