If you are going to use a pic from your computer, Type your message then scroll down In the attach files click on manage attachments.
You should have already put the pics you want to add in a separate folder just to make them easier to find. There will be several browse buttons choose the first one, go to the folder, click on the file, add another pic the same way but use the next browse button, etc. Click on upload and away they go. You should shrink the pics down to a reasonable size first also.
Retired and loving it.
Got a new 2014 Grayhawk 31DS
Hoping to get away from the IL winters