Note: We advise you to upload your images prior to creating an image grid. 

1.  Navigate to the page you'd like to edit, and click edit page
2.  In the content tab, scroll down to the content blocks area
3.  Click add callout, then click image grid - in content 
4. Click add callout
5. Browse the folders or use the search bar to choose your image, then click use selected item 
6. Add a caption if you want information about the image to appear when you hover over it (optional)