You can send photos freely with other app users through messages. With non app users you can send via MMS in which case your carrier’s charges will apply.
Open Messages Tab , all messages/conversations will appear below
Click on the attachment icon next to the Compose field. A pop-up will appear.
Click TAKE PHOTO, camera will open for you to take a new photo
Click on the send icon next to the Compose field
You can send maximum 5 photos in one message.