Received a reply for SWSoft..
Templates can be edited or created by yourself. But documentation is not ready yet. It should be ready soon, as I know. So, you can wait for some time and after that accomplish upgrade to new version. Actually, there is no place in Sitebuilder 3 where template can be uploaded. In new version templates can be installed only directly on the server from RPM (DEB on Debian) packages or by running installation script. I can't say exactly when template creation guide will be ready, so please check updates on our website.