I've installed icloud on my ipad but when I tried to install it on my MacBook re mobileme, must have blocked it and now get a message saying I need to enter another name

How can I uninstal my mobileme account and install my icloud address? Mobile me doesn't recognise my Apple ID....won't allow me to open icloud on my MacBook. keep getting a message saying I need to enter another name or pin......nothing works........I've probably blocked it as server keeps saying try later.......

The minimum requirement for iCloud is Lion 10.7.2 (Mountain Lion preferred): the iCloud Preference Pane does not appear on earlier systems - the MobileMe pane appears on Lion and earlier but is non non-functional - you cannot now open or access a MobileMe account.
To make use of iCloud you will have to upgrade your Mac to Lion or Mountain Lion, provided it meets the requirements.
The requirements for Lion are:
Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of memory
OS X v10.6.6 or later (v10.6.8 recommended)
7GB of available space
To purchase it you will have to ring Apple at the number given at the bottom left of this page.
The requirements for Mountain Lion are listed here:
http://www.apple.com/osx/specs/
It is available from the Mac App Store (in Applications). (If you are currently pre-Snow Leopard you will have to upgrade to that to access the Mac App Store: it's available in the online Apple Store.)
You should be aware that PPC programs (such as AppleWorks) will not run on Lion or above; and some other applications may not be compatible - there is a useful compatibility checklist at http://roaringapps.com/apps:table

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