I'm trying to iMessage but not going to one of my contacts.

I can not seem to add people on iMessage

The minimum requirement for iCloud is Lion 10.7.5 (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 Mavericks, 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
Lion is available in the Online Apple Store. To purchase Mountain Lion you will have to ring Apple at the number given at the bottom left of this page (it's no longer directly available in the Mac App Store) but there seems little point as the system requirements are the same for Mavericks - which is free - unless you need to run specific software which will run on Mountain Lion only.
The requirements for Mavericks are:
OS X v10.6.8 or later
2GB of memory
8GB of available space
and the supported models are:
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
Xserve (Early 2009)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
It is available from the Mac App Store (in Applications).
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
If you are running Leopard on an Intel Mac you will have to upgrade to Snow Leopard to access the Mac App Store - it's available in the online Apple Store. However if you have a PPC Mac you cannot run Snow Leopard and cannot proceed further.

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