I'm so sorry I missed your question
This might help.. When you write your post, look just above the post box and to the right. You'll see 'Visual' and HTML. Select HTML. This switches the text editor from the type with the code buttons to a plain text box which assumes you will write your own html code. Copy the photobucket html code and then paste that in your text box. You can click the visual button again to convert it back to the regular text editor. The image should appear. Please let me know if that works