Next to the comments section, you will see a box containing a button that says, "Re-caption this meme." Click on this button, and then edit the captions however you want. There is also a button next to the "imgflip" logo in the upper lefthand corner that is labeled with the word "create." Hover over the button, then click on the menu option "Caption a Meme or Image." You should get an image with a text box above and below, and there should be a list of memes next to this picture. Here, you can write the captions inside of input boxes that allow you to write the top and bottom captions. For example, you would write "Sh*tty memes" in the upper box and "Sh*tty memes everywhere" in the lower box. If you're lucky, it might get featured like this image.