Hi,
the left form is the login form, which expect a password.
The right form is the registration form and it only expect email address and full name. Once entered the password is sent via email.
At that point user can use the left for to login using their email address and the password sent.
If this isn’t how your form works, please post a link so that we can see what’s actually happening as we can’t recreate it in our demo. Images don’t help much for this.
If you don’t want to make the link public, simply tick the checkbox for “Set as private reply” and only moderators of the forum will see the link.