Just below the text box , where you typed your post
you'll see ...and click on it
+ Attachments and other options... then click on this
Attach:
CHOOSE FILE ..... your pictures will pop up
click on the one you want to post
and (more attachments) if you have additional photos ( up to 4 per post )
click POST ..and Bob's your uncle
however this Forum does have size restrictions ,,,be prepared downsize if your files are to large