HT4895: Using your Apple ID for Apple servicesLearn about Using your Apple ID for Apple services
Currently Being ModeratedSep 16, 2012 9:52 AM (in response to spunkyknitter)
Where are you talking about? In System Preferences, the iCloud icon should be there already, and the MobileMe icon will be removed when you upgrade to Mountain Lion. You can't remove it yourself (never tamper with System software).
If you have the iDisk icon in the Finder sidebar, you can just drag it off while holding the Command key down. There is no equivalent iCloud icon: iCloud's facilities are accessed through the various programs - iCal, Mail, Safari, Address Book.