You can comment with custom memes or any images you like.
1. Download the image you wanna meme comment.
2. Save it in your memory.
3. When you choose meme comment you'll see a button at the top 'Upload an image'. Click that and import your image.
4. Refresh the page.
5. Now again click the meme comment option and click on 'My Templates' tab and choose the image you've just uploaded.