how do i put a picture of my desktop under my profile on wincustomize.com?

You can do that under the settings tab after logging in. However this portion along with a few other parts of the image functions are being worked on so you could experience up and down portions of those tools.

How do I do get a screen shot? I forget.

You can go to this thread for info. https://forums.wincustomize.com/313040
It will tell you all you the steps.(With a dose of humor thrown in for good measure)

When you have the desktop set up the way you want it, just hit the PrtScn key on the top row of your keyboard while holding Shift down. Open an image editing software such as PaintShop Pro, Photoshop, Gimp, etc.. Go to the edit button and click Paste. The image should open. Then you need to go to File and do a Save As. Save as a .jpg file. Once it is saved to your desktop or wherever you have chosen go to you WC site and upload.

I hope this is right. If not someone please correct me. It's been a while for me also. Anyway I hope this helps you.  

You snuck in on me there Wiz.  

I was too lazy to type out the instructions though, thus the link to the other post.

And, FWIW, there's a problem with the upload function for Desktop Screenshots right now. At least for some of us. Opened a ticket with SD support after I had problems with it and was told it will be fixed shortly. Just wanted to let everyone know...

Edit #1: Oops... Didn't see SeaBass' comment right there at the top of the message line...

At the moment, this is your best bet: https://forums.wincustomize.com/account/images

I tried that and it didn't do anything. I have Windows Vista if that helps in any way.

What part didn't work? It works the same way in Vista as it does in XP.

just hit the PrtScn key on the top row of your keyboard while holding Shift down.

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Just hit the Prt Scrn button, no shift key.  Then paste in a graphics program as above.