If you "lost" your optifine cape you can change the username it's on by logging in here HERE. This doesn't use your Minecraft password so you might need to request a password for it. To clarify, it's not your Minecraft password you login with. You need to request a password which you'll receive via email. If you're still having issues try emailing optifine to see if they can help, there's nothing more we can do. https://optifine.net/contact Spoiler: Images http://i.imgur.com/Mmc9lcg.png Note - THIS WAS CREATED BY Lemon. I just did a simple copy and paste to help. Thanks.