If you look at my sight, www.kyleash.co.nr , where a YouTube video is supposed to be, there is a stupid SitePal advertisement. Is there any way to prevent this?

I suppose the page you are talking about is
http://kyleash.bravehost.com/iWeb/Things_I_Like.html, not the phony URL?

Easy. Drop the iframes, and put the videos directly on your page.

Okay. Thank you! But how do I edit it after I upload it?

If you want to make your life miserable, there are online editors. But why would you want to edit after uploading? Edit, then upload.