Upgrading From Mac OSX 10.5.8

I have an iMac and I have finished purchasing Portal 2 and in order for it to open it says I needed "Mac OSX 10.6.7 or later to run this" I looked up and I have Mac OSX 10.5.8. How do I upgrade to 10.6.7 or more?
Thankyou for your time.
Hardware Overview:
  Model Name:          iMac
  Model Identifier:          iMac7,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          4 MB
  Memory:          1 GB
  Bus Speed:          800 MHz
  Boot ROM Version:          IM71.007A.B01
  SMC Version (system):          1.20f4
  Serial Number (system):          W87425LFX85
  Hardware UUID:          00000000-0000-1000-8000-001B63A964F0

You need to purchase Snow Leopard upgrade. They sell on apple.com.

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