Hello! To add a photo to a person on the tree, click on said person. A sidebar opens where you can edit stuff like names, birth dates, death dates and add siblings, partners and parents. Above all these information on the top of the sidebar is a button that says "Add photo for [first name]". If you click on it, you'll be able to choose a photo from your computer to upload it.
If you want to enable or disable the photos to be automatically displayed when viewing the tree (opposite to just displaying the photo on the sidebar of a person), you'll need ot click on "Options" on the lower side of your screen, and check or uncheck the box to display photos.
Hope this helps!
