MacBook air reinstall snow leapord over Lion - back to how I bought it???

Wondering what the heck is going on with my MacBook Air end 2010 model.  I want to wipe it.  Reinstall the correct software and give it away.  Nothing is allowing this seemingly simple pricess to take place.
I have Lion installed on it now - seemingly to cause of my frustration.
Using the disc share on my iMac, it wont let me  install snow leapeard.  Using the included key drive, it wont let me use any erase features OR install on the 64 gig SSD.
Seriously?????
I need help.  bad.
thanks

Drive Preparation
1. Boot from your OS X Installer Flash Drive. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
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.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. After erasing the drive quit DU and return to the installer. Install Snow Leopard.

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