Modifying your design
You can modify your design after your initial draft in several ways. You can save the design as .lblf file and can reopen the file later for modification.

Selecting elements
The first step in modifying your design is selecting one or many design elements. Click on one element to select it. Make sure that "mouse pointer" tool-button is selected in the shape-bar. If you want to select more elements, hold the SHIFT key down and click on the 2nd element, and then the 3rd element and then the 4th one and so on.

If you want to de-select(unselect) one selected element, hold the SHIFT key down and click on the selected element. If you want to select all the elements press Ctrl+A or choose menu Edit->Select All.
To de-select all the elements, click on anywhere except on the elements.