I can not find where to plug in the end of the upholstry cleaning attachment.

Here is a pic of what you want.

http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=G2001+Kirby+upholstry+tool&rh=i%3Aaps%2Ck%3AG2001+Kirby+upholstry+tool

The tool itself does not come a part but it does detatch from the hose so it can be rinsed under the faucet.

You will want to use the hose attachment with the upholstry tool that has about a 4 inch width head on his to attach to the end of the hose. That works best for cleaning a couch.

The hose hooks into the dirt bucket on the front where a clear plastic block sets. Put the hose in that slot and then hook the tube for the water at the top of the hood.

Without the exact Hoover model number, all I can do is give you this general reference:

http://www.hoover.com/pdfs/manuals/F5857955.pdf

That should easily point you in the right direction.

I'm not quite sure where the attachment plugs in but, I did find an owner's manual for this Hoover online. 
http://www.hoover.com/pdfs/manuals/F5918900.pdf

I hope that helps. Good luck!

Easliy download the manual at Hoover.com.
The hose attached in the front of the unit on the clear front panel. Lift up the center cap and attached the hose. Then attache the supply hose to the side of steam vac for your solution.

I have a model F6211. On mine you have to remove the hose caddy and the door is under it.

Hope it helps.

Remove the entire cloth bag assembly and put the hose on the side where the bag came from. Remove the power nozzle and put the intake guard onto the front. (this is in your attachment set...the only one with little hooks that sit on the bar in front) You can change from the long handle to the short if you'd like also. You get the handles off by pushing the "seatbelt button" located at the rear bottom of the handle and pulling the handle straight up and out. Now, put your spray gun on the hose. Don't forget the little suds nozzle that goes on the end of the spray gun. I like to use a half and half solution of Kirby shampoo and water in the gun. It makes a nice dry foam that only wets the surface of the furniture. If you use more water, it takes longer to dry.

If you need a manual (book or DVD) for your Kirby, try this link....

http://reviews.ebay.com/KIRBY-CARPET-SHAMPOOER-INSTRUCTIONS-MANUAL-DIRECTIONS_W0QQugidZ10000000004594992

Hope I helped...
Marci

Check to make sure that the hose hasn't cracked, where it hooks up near the motor. If so, replace the hose.