When Finding Carter was renewed for 12 additional episodes, I originally thought this meant for a 2B, so I set up the wikia accordingly. However, MTV advertised via social media until here recently that it was a third season, therefore I went through and changed 2.13 through 2.24 to work for a third season. Now, it is back to being advertised as 2B.
I'm working on renaming all the season 3 article pages back to 2.15 through 2.24, but there are things needing to be updated beyond that. In the {{episode}} template, the season needs to be changed to 2 and the number updated accordingly; the season field in {{episode}} is what categorises the article into the correct episode. In other words, categories don't need to be manually added or removed, the season number merely needs to be changed.
You can find a list of all the episode articles needing to be updated here. The bolded episode title in quotes on the article (outside the infobox) also needs to be updated.
I currently have a blog project I am already working on remodeling, so I don't have that much time to dedicate to updating everything right now.
If you're wanting to contribute, but you don't know where to start, updating all articles so "Season 3" is out of the picture and 2B, if anything, is added into it is a good place to start.
You might have to sign in/create an account for some articles, but… if you have an account and are also auto-confirmed, you should be able to rename the articles as well!