How to make use of domains already hosted at a different provider?

Yes, you can. But the physical hoster of websites created with Website Maker is always MAGIX. There is no way to use the Website Maker only as editor (you can't transfer your website physically to other webspaces...). BUT: Website Maker enables to export and embed your site via HTML Code to any other website (same principle like to export and embed for example a YouTube videoplayer...). Website Maker creates real Flash-based websites. So you can grab the HTML Code via Export function and insert it into the index.html file of your webspace at BT. Now you can open your website with your domain. Other way is to switch your domain from BT to MAGIX (http://www.magix-website.com/uk/domain_switching.277.html).

Greetz, André