I'm an old hand here. Google Voldemort imgflip meme and see if someone copied your original meme. If you don't see it, go to step two:
Option A: if you have the original pic, or can find one either the same or similar, upload and add the text.
B: if you can't find the original pic, upload it. Type in all of the text that the original meme said. Select "More Options" change the font size to zero. The reason for this is a meme must have some text to post. The program will read what you wrote and is more likely to feature the meme than if you just put a period. Lastly, check to see if there was a watermark. Imgflip hates watermarked memes and won't feature a competing company's memes