Start a completely new design with New, or use Open or View to edit an existing design. Save or Export your created designs.
A new design can be started with New. This opens a new window where you can create a design.
Open a design into a new window with Open a design or Open Recent.
Use Insert.
When starting from a blank design, you may set the size of your Canvas and start creating your design. However, it is more common to follow a picture when creating a design. Open a picture with Load Background 
.
Save finished designs with Save, then save the final design with Export. See Export.