Addons Aren't Being Processed

For example, 3DTextScreens addon is in my server’s addon folder, but the server isn’t processing the addons there.

Here is a picture of the addons folder and a picture showing the tool bar where 3DTextScreens should be:

What’s inside 3DTextScreens folder?

Don’t use capital letters for the foldernames.

(I had this problem too and I just had to rename the folders)

Why would they be in NPCs?

I was just on the NPCs tab when I was taking the screenshot of the tools menu.