You have to in 1 settings/advanced access management in the tab "settings" to specify :

automatic registration and then specify the database and the table name you want to use.

You can see some explanation here : http://help.websitex5.com/en/v13/pro/index.html?area_riservata.htm&utm_source=software&utm_medium=Professional_13

Hope this helps you.

John S.