Then you just click on the Meme Comment option to the left of Text Comment. You can either use one of the templates, or Upload Photo to use your own. And then it's just make a meme as normal. I hope that helps.
I think you need to type something... even a single word; they click 'add meme'... make the meme, and click 'Generate'... if your meme speaks for itself delete the 'filler comment', and you should just have a the meme left