WordPress MU

I have been unable to post any HTML in a blog unless the Wysiwyg entered it. Even if I go to view html source and add it in the editor just removes it. Is there a way to add HTML into a post? I am trying to use embed tags and can not do it. On a normal Wordpress site I am able to do it.
Thanks
Jerad

Jerad, have a look the WPMU-FAQ http://donncha.wordpress.com/2005/09/23/wordpresscom-faq/ #3. Since wordpress.com and WPMU share the same code, you'll find the answer in the FAQ.

If you really want to allow more HTML, have a look at all files kses* .php in your install.