If you forgot the password, you can use the password reset function at the login screen to setup a new password. Password reset link is sent to the email address you used to sign up. Therefore, you can't reset your password if you didn't enter your email address correctly when signing up.
If you wish to change your password when logged in, you can go under account settings to change the password by entering the old password and the new password.
The password is encrypted and not even Moaform operator can access it. Fill in your email address accurately and keep your password safe.