Anti-Splog not showing up in wpmu plugins under site admin menu

I uploaded the anti-splog files to the /public_html/wp-content/mu-plugins/anti-splog folder There are five files there, one image, one js and three php in the anti-splog folder, plus I uploaded update-notifications to the /public_html/wp-content/mu-plugins folder

Got the api key, but nothing shows up and I don't know where to put it. I can't find instructions in the manual, or the readme text files

Old folks need a lot of guidance here it seems. Sorry for the bother.