A quick instruction list (10 easy steps!) on how to use any of these icons when posting on LJ:

1. Save any of the icons that you like (either to your hard drive or storage device).
2. Go to the home page of your LJ.
3. Look for the dark blue menu bar near the top of the page.
4. Click on "Profile" and then "Manage Userpics"
5. A blue section will appear on the left-hand side of the page that says "Upload a New Userpic"
6. By default, "From File" is selected. Click on "Browse" and then find the icon you saved that you want to upload to LJ.
7. Make sure you enter a Keyword in the space provided (only you will see this; it's so you can find your icon later, in your list of userpics)
8. In the "Comment" section it's nice to give credit to the person who made the icon.
9. Click on "Proceed" and the icon will be added to your Current Userpics (shown on the right-hand side).
10. Next time you want to use that icon you just uploaded, when you're posting, click on "picture to use" above the message box, and select the icon using whatever keyword you gave it.

That's it!

A quick instruction list (10 easy steps!) on how to use any of these icons when posting on LJ

Bless you. ;)