You can use the Add Item menu to add an expression, note, table, folder, or image to your graph. To start, click on the "plus sign" and then choose the type of item you'd like to add to your graph. An example of each is below:
Pro-tip: Adding an image is not available on the student side of Activity Builder. However, if an image is added on the teacher side, students will be able to use the image in their graphs.