Stencils are a collection of related shapes, which are the building blocks of all Visio diagrams.
Browse for shapes
In the Shapes pane, select More Shapes.
Point to a category to browse the stencils in that category.
Select the stencil that contains the shapes you want.
Select a blank area of the drawing page to close the menu.
Select the name of a stencil to see it’s shapes.
Search for shapes
In the search box, type in a keyword that describes the shape you want, and select the magnifying glass
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Select Local to see shapes displayed and categorized by their Visio stencil title.
Or select Online to see shapes available on the web.
Add shapes
Drag the shape you want from the stencil onto the drawing page.
Tip: To find out how to use a shape, point to it to display instructions.
Source: Microsoft