I’ve only just seen this but as Jan had said if you’d have asked I’d have done my best to help you.
I admit the documentation is lacking but the other people I know have used it don’t seem to have any errors. I’m guessing by your comment you ticked the box and then it didn’t show in the widget area, did anything show? Do you have any caching plugins enabled at all as it might not show up until the caches have cleared.
I’m not sure what you mean by you were unable to visit your homepage but I’d guess some form of server error, do you have any information other than that?