Seriously, I can't find it!

It should be next to the X when an image needs its approval.

I still can't find it!

These are 4 buttons, which all affect the submitted meme. The checkmark automatically approves said meme, whereas the X gives you a prompt. You can choose the reason for an images’ disapproval, and then click “Disapprove”, thereby disapproving said meme. The last 2 buttons affect the visibility of the meme.

I don't see those buttons on my screen.

*sigh*
Click on your name on the top right corner, click “My Streams”, and then there should be some images needing approval. Click on the grey text, and you should see those buttons below the meme’s information.

Oh, I thought it was on the image's page!