Themes are the skin of XOOPS Cube websites. You may change the look-and-feel of your site by changing the main theme. How to customize the graphical identity your site?
The main theme is the default theme of your site.
Download and unzip the theme archive. Then upload the theme folder to the directory "/themes" of your of XOOPS Cube website
A theme may need a special render-system. 'Legacy Renderer' which is released by default, can handle the theme formats of XOOPS2 and XOOPS Cube Legacy. But you can install other render systema and extend XOOPS Cube with themes compatible with touchscreen Mobile devices. Please, read the theme installation note, if any, to avoid issues displaying your site content.
Users may select their favorite theme from a theme list that you specify. To that end, you need to list up selectable themes and install 'Theme Select' block for visitors.