You have to have the picture hosted elsewhere...such as photbucket as you mentioned and what we use, unless we pull it from our website. Once it's on photobucket, it's pretty simple. Just go to the picture on photobucket and to the right you will see code. Click on the direct link (it should auto copy the link when you do that. if not, right click and select copy). Then come back here and click on the little picture button in the posting editor. Paste in the link (helps to select a max width of around 800...it will automatically adjust the other setting.)