I've just installed the Bookmarklet on a Safari (version 6.0) on a MacBook Pro. I dragged the icon on the My Home page up onto the Bookmarks bar. Then added a recipe from a website using it.
Can you let me know what version of Safari you're using. And let me know where you're having a problem. Does it install/not install? Does it not work when you try to add a recipe?
If you could give me some more information - we'll figure out what's happening, as it should work OK.
Thanks