When posting you will see (Go Advanced) to the lower right, click and screen will open up, scroll sown to Manage Attachments: click and a new smaller window will open to the left and hit the add files, add as many as you need then check drag them sown to the attachments box (8 max) . then choose inline for this
and it will put them wherever you cursor is, or hit done for pictures in the Attached Thumbnails box
There are other ways of doing it using the "insert Icon" but I usually don't.