drewtoby:
I'll use a different image host next time. That is annoying.
It's possible to use images from that host. You just need to get the actual image URL:
But better yet, if you read the guide at the link Grumpy_Mike posted, it shows how you can attach the image to your forum post and then embed that same image, so you don't need to use an external host. This is nice because it makes it less likely that the images will break over time, which often causes information on a forum to become less useful as a reference over time. Until you have reached your 100th post the forum does make you wait 30 seconds before you can edit your post to embed the images but that's not too long to wait.