Open the theme customizer for the theme where you want to add the desired blocks.
Click on "Customize"
Navigate to the desired template.
Add a new section or block to an existing section, then click on the "Apps" tab to search for the desired Snap Block.
In this example, we're adding the "Image Compare" block.
Select the before image.
Image picker.
Select the after image.
Explore and adjust all available options.
Review all changes and save them when you’re ready to publish.