All you have to do is click on the page for the meme, type it in and press 'generate'. Even Hell Bender can manage it, unfortunately. There's loads of sites that do it, I prefer meme generator.
Also Hell bender, joking about mass death? I seem to recall you being opposed to that when I did it ... quite strongly opposed in fact.
idk, i think it's funnier that way BECAUSE it's so insensitive and horrible, wasn't nice to put it about something that actually happened (probably would be better with something like "hundreds of deaths due to mass accident")
General advice:
If you're unsure about formatting, use the "Preview" button (it's right next to the "Post" button, can't miss it!) to verify a post will come out as intended before you submit it.