I used to use Photobucket until they quit allowing links to the free sites. I found this on their website
If I remember correctly you use the 5th option "img" copy that then just paste into your message where you want it to appear. If it's not that one you can try the others using the "Preview Post" button.
I prefer linking, I post to a number of sites and it saves bandwidth and time not having to upload photos to each site. It also saves the host bandwidth since they don't have to store your photos. Bandwidth costs money.