In a landing, various icons can appear on buttons, in a text or individually. All of them can be changed for other icons and assign a specific action.
To be able to modify any property it is necessary to click on the icon and the details bar of the icon will be displyed. In this bar it is possible to change the icon character in the Icon tab. You can search by name or select an icon from the list.
The actions associated with the icons must be activated and configured in the Link tab of the same details bar. More information about the shares at What actions can a button, image or icon perform?.