Sorry, but your question isn't very clear.
You must install Snow Leopard 10.6.6 or later in order to purchase and download Lion.
1. Boot from your OS X Installer Disc. 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.
If you are preparing an external or a non-startup drive, then open Disk Utility in your Utilities folder.
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. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs) then click on the OK button. Click on the Partition button and wait until the process has completed.
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.) 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 can take up to several hours depending upon the drive size.
Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive.
If you didn't create your own boot installation disc or drive:
...you can either use your Snow Leopard install disk to reformat your hard drive, install Snow Leopard, then update to Mac OS X 10.6.6 or later, and use the Mac App Store to redownload the Install Mac OS X Lion installer, and run the installer again.
Or you can boot your computer into Recovery HD, a small partition that was created when your first installed Lion. To do this, either hold command-r during boot, or hold the option key during boot and then choose Recovery HD from the list of bootable volumes. With Recovery HD, you can reformat the other partitions of your hard drive and download and install Lion.