Plugins Won't Appear?

Hi,

So I just started using Elgg a few days ago. Everything's going smoothly so far. However, I'm facing some problems with the plugins.

I decided to try out a new plugin or two. I uploaded them to the 'mod' folder like they're supposed to be. When I go to 'Tools Administration', the plugins appear in the list as well. However, once I enable them ... Nothing happens! You know, like each plugin is supposed to have it's own ... Control Panel sort of thing.

Any help  would be greatly appreciated.

 

Cheers.