Welcome from Texas.
To post a picture:
I click on the "Go Advanced" tab just under the quick reply section to post pictures. Then scroll down to the "additional options" section & click on "Manage Attachments". Then I go to "browse" & select the picture I want to post from pictures in my file on my computer. You may have to resize your picture as sometimes it won't accept a pic if it is too large. Hope this helps.