The interface objects can be found in the panel on the right side of the screen inside the app builder.
Start by drag and dropping the object onto the canvas or simply click to add it automatically.
Their color representation is green:
Each interface object will be added to the standard tab and standard group. If you wish to reorganise the appearance of the interface object on the dashboard, please use the dash builder in the right inspection panel.
To find out more about certain objects please refer to the Object Reference.