For adding a new Page Tab (those little icon boxes under your cover photo), you can:
* Click the down arrow on the right and then hit the "+" sign. Then, find your app. This can be tedious and difficult, frankly.
* In the "Application as Page Tab" config area of JFBConnect, if everything looks right, there should be a line at the top that looks like:
Your Page Tab application appears to be setup properly. To add it to your Facebook Page, Click Here.
Click there and you should see a list of any Facebook Pages you are an administrator of. Select the one you want to add your Application too and hit Save. That will add it to the boxes as well.
Hope that makes sense... and yes, the terminology between Pages, Tabs, and Applications can be incredibly confusing...
Good luck, and let us know if you need anything,
Alex