What kind of computer are you using and what browser are you using? I have a Mac and am using Chrome, and I don't see the "abc" button, either, but the third button from the left in my quick reply window is an "Insert Image" button. Incidentally, the second button from the left is "Insert Video" and looks like a little film strip. When I click "Go Advanced" at the bottom right of my Quick Reply window, I get more buttons and the "Insert Image" button moves to 6 buttons from the right in the middle row (of three). Does this help?