I click on "show embedded codes" at the bottom of your meme on the edit page,I use the top code copy/paste.(I don't know what the other 2 codes do) I paste it as comment and click "text comment" at first it appears as black and it doesn't work,leave the page and come back to it after a few minutes and it should work.
I've only had a couple that didn't work doing it like that.Maybe try copy/paste one of the other codes?