You should be able to use the ItemTemplate of the Rotator, similar to this example in the documentation;
So, essentially set the Rotator to bind to your database, and in set the template as so:
<%# Eval("htmlContentColumn") %>
Where "htmlContentColumn" is the name of your column in the database.
What you'll also need to do is set the Height and Width of the RadRotator as well as the ItemHeight and ItemWidth.