If you're doing it from Photobucket, just copy and paste the IMG URL into your text box. If you want to attach pictures, click the paper clip icon up top and you'll be able to upload any pictures that are stored in your computer.
There on the tips of fair fresh flowers feedeth he; How joyous his neigh,
there in the midst of sacred pollen hidden, all hidden he; how joyous his neigh
finally got it to work from photobucket, couldn't copy the image for some reason though without highlighting the pic first, if I just right click, it only gives option to copy shortcut with it not highlighted