Renaming "Activity" in the menu

Howdy, First I like to say I'm not a developer. Im a swamper living in louisiana. I just wanted to make a small community for like fisherman to share

thoughts, pics and what not. I installed elgg 2.3 and I got it working pretty good. You can check it out here    As you see I have managed to rename some menu items but i'm stuck on activity.

if someone has an easy fix to this I would appreciate it. As I said I only want to change the menu name.