2k share is a way to share rosters, settings, etc. through XBox Live. First, you will need to be able to connect to Xbox Live. It doesn't matter if you have a gold or silver account, both can access 2k share. Once connected, start up CH and access the following menus:
>Features >2k Share >Browse Files
After that it will list files that other people have shared, which are rosters, settings, chants, and legacy saves. Find one you like and download it from there.
Hopes that helps a little
