As Martin mentioned, tools from the Tool Shed cannot be loaded into the public Main Galaxy instance at http://usegalaxy.org. And from what I know, other public Galaxy instances have the same policy. Administrative permissions are necessary, but beyond the technical criteria, the reason is so that tool content is managed by the instance owner.
That said, I opened a Trello ticket last summer for the team to consider including this tool on Main. A decision has not been made yet. You can review the request here (and vote on it): https://trello.com/c/goBlVjVW
Instructions for Trello (if needed): http://wiki.galaxyproject.org/Support#Galaxy_Issue_Board
To use this tool right now, try a local or cloud Galaxy. More help is here:
Best, Jen, Galaxy team