Want to change the passcode of the "My Eyes Only" Snapchat feature then follow the give below steps -
1. Open your Snapchat application and go to the "Memories" section.
2. To change the passcode to access the “My Eyes Only” Tab.
3. Tap on the "Options" at the bottom of the screen of the "My Eyes Only" Tab.
4. A Pop-up will appear on your screen with two options - Change Passcode or Forgot Passcode.
5. Click on the "Change Passcode" option to create a new passcode of "My Eyes Only".
6. Now you should enter the current password and set a new one. Then confirm the new passcode and you are all set.
For more read - https://onlinegeeks.net/recover-my-eyes-only-pictures-on-snapchat/