I don't know why you're asking how to do click to show comments because I've seen you doing click to show comments on imgflip! This is the instructions to refresh your memory!
go the image page | click "show embed codes" | click in "BBCode" | copy the text | go to your comment | paste in the link and then delete everything before "http://" and everything after ".gif" (if you want to post a normal image as a comment, do exactly the same thing but instead of ".gif" it will say ".jpg"
