I started a thread in the General forum about the hammock I'm weaving and included 3 pictures. Well, the html is there, but the pictures don't show. I guess I've not posted pictures that I have hosted off-site at Photobucket before. What is different about posting them here? My html fu is not strong...
You can't use HTML directly in posts. That's why your embed codes aren't working.
When you're composing a post, you have to click the 'Insert Image' icon above the text window, and it will prompt you for the URL of the off-site image. Once you paste that URL in and click Okay, it will be put in your post.
I fixed the image links in your thread for you.