LockMyPix will create your vault on first app start if you do not already have a vault. Enter your private pin, password or pattern.
Use the keyboard icon in the top right to switch from pin- to password mode or tap on the pattern icon to create a pattern.
Make sure to activate the password recovery if you have not done yet in the LockMyPix settings. Once you forget your password use one of the recovery options to recover it. It is not possible to recover your password without any recovery option.