Choose the caption bubble to begin. If you want to upload a custom bubble or alternative image then submit the caption first, then edit the comment and attach a "Place img". Once the image is approved you can use it by editing the caption again.
You just plussed me enough for me to take the lead! Big mistake! I am 2% more popular! You're gonna have to post a journal hailing warsow to take the lead again :D.
(Sorry :D)