I'm trying to send a message and do not know how to attach a picture. I've got the draft written and the picture selected in Gallery but cannot figure out how to attach it.
In the message app, look for a paperclip. Tap that and it should open Gallery (or some other "view pictures" app, depending on what the default app is in your phone). Choose the picture (tap it) and the message will include it.
Facebook
Twitter
Instagram