• Press the white menu button, top left corner.
• Select the word "accounts" (it's a button)
• Select "manage accounts"
• Be sure your sunlit7 account is the active account
• Now look at that little trash can with the x in the middle off to the right.
• Press it to remove key

It's the same for everyone. You don't need a screenshot. Your private keys are hidden behind your public keys. By following the directions, you'll be able to see which keys you have. The directions are clear. There are only two options. View private key, or the trash button to remove it.