To attach a photo, it can not be any larger than 400 x 400.
You could also download them on a free linking site like www.imagestation.com
To post pics by using imagestation or one like it, this is what you need to do.
First download the pic on imagestation, then right click on the picture, go to Properties and copy the code. It should look something like this:http://www.imagestation.com/picture/...ourpicture.gif
Then click on the button IMG above your post and paste the code there. Viola! It should work! If you have any problems, just ask and I'll try my best to walk you through it!