You have to sync your steam account with your forum account, this will open up the tech support forums to you and allow you to post your question there. If there is a problem syncing your accounts, please
contact support.
Also, we need information from you on what isn't working e.g. error reports, what exactly is happening (crash at start up, crash at a specific point, are you using mods, &c), your computer specs. Posting "Help my game doesn't work" is not the best way to get a response because there is literally nothing I or anyone else can do with the information provided.