And if you'd prefer to set it up yourself, you can go to the top right of the window where it says your username, click the dropdown arrow, find and click "Sales & Bundles", then click "Co-Op Bundles" and it is self-explanatory from there.
I set it up, but I don't know where you should go to check it. I assume you check in the same place I just said you would make a bundle, but I'm not sure. There is no share button. I would assume you'd get a notification, but...?
Oh, and it needs some input from you, which you can see when you figure out how to view it.