To add a gallery to a canvas on your site select the canvas where you want your new gallery to appear and then hover over the square icon at the bottom center of the designer and choose Gallery.

Your new gallery can be resized by grabbing any corner of the gallery and dragging it smaller or larger.

A black box will be placed on the canvas and in the right side panel under the Gallery Images section you’ll be able to add your images from your Media Gallery.

Under the Gallery Settings tab in the right side Properties Panel, you can choose which Gallery Type you would like to use.

You can find more information on gallery types in this article here.