I saw several posts on Stackoverflow about how to link your apps to Facebook pages that are already created. However, I cannot do the same. The page I want to use is displayed as gray.

Also, the Fablelane Community page is what was created when I clicked the Create New Page button. This is not what I want (I want the existing "Fablelane" page), but apparently I cannot select it.
- I tried to rename the page in the same way as the application name.
- I tried to set the page category to the Brand / Application page.
- Despite the visibility on the list, I can not click on it, and this does not give me a reason.
Can anyone help?
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