This varies depending on the launcher. (See "What is a launcher?") Our app allows you to apply many different launchers straight from the dashboard. If you select a launcher from the app that you don't have installed, the app will automatically take you to the play store to install it. Then you will be able to apply the icons to it from the app. You can also apply the icons through your favorite launcher.
Some of this is confusing if you're not familiar with the term "launcher" and what that is. So, please take a look at the "What Is a Launcher" article, and browse through that a bit. It's not actually that complicated, but opens up a whole new world of possibilities for your mobile device.