need a mods help to fix my image issue

I uploaded an image and by mistake it was the more compressed file. How can I remove it and put the higher quality one up?

Upload the file again as a new image, and report the old one as a duplicate. If you get an error about uploading a duplicate, report the image that you want to replace and we’ll tell the system to let you upload the replacement.

@Derpy Whooves  
Sweet, thank you :)