iCyEvolution

Yea, I've tried that but it still gave me no luck

Hey guys, I'm extremely new to the game so bare with me, but after purchasing and installing the base game and some DLCs I noticed that it seems like the APEX DLC I bought and installed is not there ? I contacted steam and they said they can see it in my library, I guess I'm just not sure how to access it ? do I need to progress further in the SP or ? PLEASE HELP