Having just done this I will try to post a good step by step way to post your pictures. I don't have photo shop or any other photo software so this is how I did it. I am sure there is more than one way to post a picture.
save your picture to my pictures on your hard drive
set up an account at photobucket.com (it's free)
log onto photobucket.com
where it says upload images and videos, hit browse
go to my pictures and click your picture, then hit open
next, hit upload it
you will see your picture on the screen with 3 codes underneath it
copy the img code and paste it into your post
presto! your picture should appear like this
Oh, one more thing. Make sure your picture is not too big. My picture is 400X300 pixels. You could probably go a little bigger, just make sure the picture isn't too big.
Hope this helps anyone else who may be trying to post a picture for the first time.