Login to your hosted chat management interface at https://<your_link>.hosted.chat
Click “Settings” on Menu in the top menu bar
Click on "Sites" right beside "Global settings"
Fill in the fields of the "New Site" dialogue box including Title, Site URL, email address (all manditory) and you can also add a site logo here (optional)
Short video here:
https://www.screencast.com/t/TZZORIAJMh7G
An example of a site about to be created:
https://www.screencast.com/t/uoW5y3v44TJ