There are many ways to post pics on sites, here is just one quick tutorial.  So here we go,

First go to www.imageshack.us and select the Browse button on the page:

That will open a new window, find where the file is on your PC and highlight it, then select Open

Next select Host It

From there a new screen will come up, with a small pic. and lotsa scripts, for this purpose only
go to the bottom next to where it says "Direct Link to Image"
highlight EVERYTHING in that line and right click
and select Copy

Then come here and in your new thread click on the little mountain Pic:

In the new pop up window right click and select Paste, and then hit OK

And done:

Now like I said that's only 1 way of doing it, another hosting site is photobucket.com works in a similar fashion.  Hopefully this helps out and  if anyone still has problems or questions feel free to PM and I can help out...

Joe