Please follow the steps below to post your dance video to UDN blog.
(1) Use your digital camera -> Switch to Movies mode -> Take your dancing video clips using your digital camera. Make each video clip length less than 10 minutes each.
(2) Download your dance video from digital camera to your PC hard disk.
(3) Use Microsoft Window Movie Maker (Which is free and can be downloaded from Microsoft) to edit your dance video clips. You can add your video title description or video clip transition effect via this Microsoft Window Movie Maker.
(4) Use Microsoft Window Movie Maker to make your dance video become a new dance WMV file, which size is smaller and easy to upload later.
(5) Use your free gmail account to open a new free account in http://www.YouTube.com
(6) Upload your new dance WMV file to your YouTube site.
(7) Copy the embed HTML codes from your YouTube site to your UDN blog new article. It is done.
Let me know if any step you need more explanation.