IMac, iPad, iPhone, Mobileme, iCloud sync

I have my iPad and iPhone calendar synced through iCloud.
I googled how to sync it to my iCal on my iMac, and it says to go into system preferences and click the iCloud button under Internet & Wireless but mine says Mobile me.
I was a little familar with Mobile me in school, but I know at school we had a password and had to pay for it and all the good stuff.

anyways, can someone tell me what I'm doing wrong so I can get my iPad/iPhone calendars synced with my iCal on my iMac?

Wow.

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