How do I get my picture off the desktop and into my picture folder

Your question is vague. You don't explain if this is a desktop background picture or just a picture file located on your desktop.

If it's a picture file, just right click and select "cut". Go to you library/pictures, right click in the right pane andselect paste.
 

MOREB

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Oct 2, 2012
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IT IS A PICTURE FILE ON MY DESKTOP NOT BACKGROUND PICTURE
 
Isn't this chrissy1980's thread?

Anyhow, just cut/paste as I said before or drag-n-drop it into your pictures folder.

Also, seems confusing...

The original question:
How do I get a picture off my desktop and into a picture file?

Later comment:
IT IS A PICTURE FILE ON MY DESKTOP NOT BACKGROUND PICTURE

This makes the original question seem moot since it's already a picture file.