Use the pictures' URLs in the Text Box with this around them:

left arrow img src=URL right arrow With NO spaces except the one between the img and the src.

"Left arrow" is the symbol at the top of the comma key and "right arrow" is at the top of the period key.

Put each in a line by itself in the Text Box. The Optional Image URL box is for a single pic with the URL only.

The URL box with automatically put *PIC* in the Subject Box to show there is a pic if you click on the post.
But if you put pics in the Text Box you will need to manually put *PIC* or *PICS* in the end in the Subject Box.