Open the picture in the database and you will see a BB Code right above the photograph. Highlight the BB Code info from the first bracket to the end bracket [dbphoto_]xyz###[/dbphoto] (example of code to highlight)
then hit the keys Ctrl+C, switch over to your post and then hit Ctrl+V where you want to place the image. Easiest to do this with both windows open.
I have never figured out how to do this from my smart phone. Maybe someone can give those directions?