How we work, it's very simple:
1. Create an account using your email or connect to your Facebook; if you've already done that, just login.
2. Using the search box find the game you are looking to play, alternatively navigate to the platform the title is on and find it from the list of games. If you can't find the game your looking for, drop us a mail here and we'll have it added right away and let you know when it's available.
3. Click Create Session and enter your parameters that best suit. You will need to specify your game platform, region and describe the experience you want. Don't forget to add some extra info in the details box, it'll make sure you're all on the same page.
4. Wait for people to find your game session and join you.
5. As the host you will then need to add the other players using their GamerTag, PSN ID, etc..
6. Enjoy gaming your way!
Alternatively: find a session that has already been created for the game you'd like to play. Make sure the parameters match the way you want to play, and if it does, hit the join button.
The host of the session will then add you, so keep an eye on your friend requests on your Xbox, PlayStation, etc.