After you manage attachments. Take note as to what each photo is named. In the body of the thread write your wording, then hit the paper clip and attach the photo after your wording. Make sure you have placed your cursor where you want the photo to be.
The place your wording after the attachment and repeat for the next photo.
Hopefully this helps. As I type this it makes sense to me but I know I may not be explaining it super clearly.
Lastly, I recommend previewing the post so you can make adjustments prior to it going into the thread.
Marty