At the bottom of the "Quick Reply" box you will see a tag that says "Go Advanced",
once you click on that farther down the page you will see a section that has additions,
in that box you will see a box that says "Manage Attachments", when you click on
that it will take you to another section that gives you the "Browes", that is where
you can click on that and pick the photos you want to attach to your message.
Once you choose the photos,you click the "Upload" button and it will upload
your chosen photos to you message, once they have uploaded you hit, "Submit
Reply" and you are there.