FMRTE is Football Manager Real Time Editor
Which means, editing on the fly, you'll need to install a framework for it to work though, it will prompt you when it's not installed, then you will have to choose the FM version that you have, steam or hard copy. Click "Load game" AFTER or WHEN you already have your save game running in FM11, I can't explain how to edit something specific as I don't access to it right now, but it should be pretty straight forward, it has a search function as well (for clubs, staff, players etc.)