From Dashboard click on "DATA" (top menu bar)

select the "Flowers" or "Hard Goods" tab

click the pencil icon to edit the flower or hard good

If the item does not have an image, click the "Upload Thumbnail" button and a pop up will appear where you can upload or drag and drop an image.

crop the image and select "Add"

Scroll to the bottom of the item and click "SAVE"

If you want to change an image you've previously added, click the pencil icon to edit, then click the trashcan icon to delete the previously added image, then click the "Upload Thumbnail" button. Remember to click "SAVE" at the bottom of the form when you are done making changes to the image.