Elements are the building blocks that makeup a page design e.g.
Gauges (Rotary/Liquid and Liner) * Liquid guages are in version 5.2.1 only
Click and drag the elements onto a page to start designing, then resize them by clicking and dragging from the corner of the element. There are W (width)/H (height)/X and Y values which change as the element is moved to ensure the element is in the exact size and position you need.
To configure an element, select it then click on the cog icon in the element properties box on the right of the screen.