How do I Erase & Install from the Install CD?

It's a long story but I need to do an Erase & Install on my new Intel iMac. I originally used Migration Assistant and my system is running super slow. People have suggested that perhaps I shouldn't have used Migration Assistant. So now I just want to clean the HD and start from scratch. Everyone tells me to just use the Install CD and go to Disk Utility. My question is how to I get to disk utility. When I boot from the Install CD it seems to think I only want to upgrade my system when in fact I want to erase the disk and start over. How to I get to Disk Unility?
Thanks,
Ben

Extended Hard Drive Preparation
1. Boot from your OS X Installer Disk. After the installer loads select your language and click on the Continue button. Then select Disk Utility from the Installer menu (Utilities menu for Tiger.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. Otherwise, click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Partition button and wait until the volume(s) mount on the Desktop.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process will take 30 minutes to an hour or more depending upon the drive size.
After the formatting is completed quit DU and return to the installer. Proceed to install OS X.
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