I have os x version on an imac but want to upgrade to mountian lion how would oi do this?

I have os x version 10.5.8 on an imac but want to upgrade to mountian lion how would i do this?
this is in my about this mac section (if this helps)
Hardware Overview:
  Model Name:          iMac
  Model Identifier:          iMac7,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.4 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          4 MB
  Memory:          2 GB
  Bus Speed:          800 MHz
  Boot ROM Version:          IM71.007A.B03
  SMC Version (system):          1.21f4
cheers Nino

Hi nino8881
1) It has to be an iMac Mid 2007 or newer. If this is the case ...
2) Make sure you have Lion or the latest version of Snow Leopard. (You can't upgrade from 10.5.8 to Mountain Lion.)
3) If step 1 & 2 are checked, you can download OS X Mountain Lion from the Mac App Store and install it.

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