The Recovery HD is installed as part of the Lion install.
If you have completed the Lion install (which would take 30 minutes or so), then you should simply ignore (for now) the Recovery HD.
However, I don't quite understand what you mean.
Are you saying that you have booted to the Lion installer, and you can't actually start the install?
I would suggest that you simply start over from the beginning of the install.
If you just want to erase the hard drive completely, and install OS X to an erased hard drive, then why not just do that?
Reboot to the Lion Installer. On the first screen, where you can choose from a list with one being Disk Utility, Open Disk Utility, then choose your hard drive. It will probably be the only one with a manufacuturer's part number - like WD35J0600- 600GB. Then underneath would show the partition name, like Macintosh HD, or Mac HD, or something with someone's name (because someone else, such as yourself, actually named it!). Click on the manufacturer's line so it is selected, then click on the Erase tab. Name the hard drive if you like, make sure the format is set for MacOS Extended(journaled), then click the Erase button. Takes a few seconds to complete, and your hard drive is erased.
Quit Disk Utility, then choose Reinstall OS X. Follow the short steps to select your hard drive (which you just erased), and continue with the install. Again, the install will take 30 minutes or so - maybe more than an hour, but usually not that long.
When it is done, your Mac will automatically restart, and take you to the setup for a new user account.
And, you are doing fine!
Let me know what about this does not work for you, such as where it stops, and what you see on the screen.
If you have a difficult time describing what you see, a screen shot, or even a picture, would help greatly.