Forum:Am I allowed to add new informations to an unreleased episode?

http://images4.wikia.nocookie.net/__cb20091227230730/adventuretimewithfinnandjake/images/archive/b/bc/20100401212842!Wiki.png

I'm new here and I may don't really understand how to edit pages. For example, I just found on Wikipedia some new informations from the unreleased episode "Betty". I added it to the synopsis, but about a minute later, it got replaced by another user with TBA. I tried it again and the same thing happened. Is it possible, that I'm not even allowed to publish this on here?