Visualize is the place that you can design your Captive Portal. On this page, you see all the created SSIDs and. You should click on the pen icon to design you portal for that SSID.
There are three different pre-defined layouts that you can choose among. After deciding on the layout, to adjust it according to your business, click on any component to change its features like color, text, or picture.
If you would like to design the portal on your own, you should go for drag&drop option by clicking on 'Drag&Drop' on left top side of the page. You can drag the components and drop them to the box defined by red dashed lines.