adding/embedding external videos

At my new site www.satisfy.tv, where Hostonnet is just about finalising all with installation, I have tried to upload via the option 'Remote Server' on the upload form. Basically, I tried to load the video at http://www.redtube.com/3160. But, the error message 'Invalid url' comes up.
(At the above Redtube page, I have also tried the link given in 'embed this video on your website' - but no luck).
So, how does this work? How do you embed/add external videos, hosted on other adult sites, into Satisfy.tv?
Please guide.

Thanks,

Frederick.