Step by step:

Here's how to embed photos in a post from Photobucket. Once your picture has been uploaded,the appropriate HTML code will be the one in the "DIRECT LINK" box (hold you cursor over the desired image thumbnail).
Let's say, as an example, that the address of the picture you want to post is http://somepicturesite.com/yourpicture.jpg

To embed the picture into a post, copy the code by clicking in the "DIRECT LINK" box. It will be copied automatically. Next, return to the GardenWeb "Post a Follow-up" message box and:
1. type the command 2. Right click on your mouse and paste the copied link next to the open quotation mark like this 3. Close the command with ">
4. For additional embeds, press the "ENTER" key and repeat.