Up until now, you can post pictures in message boards only if you have it saved somewhere else on the internet. For example, your baby album. Find the URL to the picture you want, then when you post a message, there's a button next to the mail button with a small image on it. Click that, enter the URL of the picture. The problem with this is sometimes the website you are pulling pictures off do not allow off site retrieving and the picture will not show.
I've created a general section within our site for this purpose. When you post a reply/topic etc click on the image manager this button

. In the drop down popup, click General->Go you will see on the right most a link come up says Add Image. Click on that to upload your images. Pay attention to the size & file size limits or the system will disallow the pics.