From photobucket scroll your mouse over the picture and a box will pop up. Click on the direct link box it will say copied. In ECF click on the photo icon (it looks like a tree) a box will pop up. Click on the "From URL" tab, right click and paste in the URL box, uncheck the "Retrieve remote file and reference locally" click ok. A link to your picture should be in the quick reply box. If you want to make sure the picture is there then click on the "go advanced" button.
From another website, right click on the picture that you want, and click on “copy image location”. Using the same photo icon in the quick reply box, paste the link that you copied and click OK.