I can't figure out how to attach photos on this site.
You don't "attach" photos here, as such. You'll need to upload the photos to the Internet somehow, then use the "Insert Image" button on the message-editing screen to insert a link. The button looks like this
; it's second from the left on the second row of buttons, just under the italic "I" and above the
and
smilies.
I have my own paid webhosting where I put my photos. Others can advise you on free photo-hosting sites--some of them will allow remote linking of images, and some won't.