Tap the Shapes button to open your shape menu

Tap the Name search text field to locate a library.

You'll now see the available shape libraries based on your search.

Tap a shape from the library to add it to your canvas.

Tip! If you need to create a custom shape, please check out this help article for more details ! 👍.  https://arcsitesupport.zendesk.com/hc/en-us/articles/6907366837012

You'll now see the shape on your canvas and can adjust the dimensions and placement.

Tap and drag on the shape to adjust as needed. 

How to add shapes to your canvas