Frames support is only available in WebEasy Professional.
There are two styles of site that use frames:
1) Centered on full-screen (Kiosk style). This will make your site always appear centered on the screen, by adding four frames to your site, one on each side of your page. You cannot put anything in these frames, they just make sure the site is centered.
2) Split with last page as frame. This causes the last page of your site to be turned into a "navigation" frame that runs along one side of the screen when you view your site.
To select one of these styles, go to the "Build" menu and select "Web Site (HTML)". Check the "Dynamic HTML" box, then click the "Advanced" button and select the desired style from the "Web Site Style" box.