i usually select all the text and "Command C" to copy it just in case if i feel that i may loose it.
Are you hosting the images here or on another website, such as photobucket.com or flickr.com. are you using the image tags?
[ img ]url goes here[ /img ] <---- no spaces in the brackets.
if you need to list multiple pictures, use the img tags with each image. you'll want one window for the reply and another for the picture hosting website to avoid posting and going back to your image host and copying the URL for the picture and coming back here, finding your post modifying it and again and again and again.
do you need me to make another tutorial?