Hello,
You have to customize code in two place.
First go to sb-login/sb-login.php
Find this code:
nd_login_load_template( 'tabs.php' );
nd_login_load_template( 'login-form.php' );
if (get_option('users_can_register')) nd_login_load_template( 'register-form.php' );
nd_login_load_template( 'lost-password-form.php' );
Replace it with this:
nd_login_load_template( 'tabs.php' );
if (get_option('users_can_register')) nd_login_load_template( 'register-form.php' );
nd_login_load_template( 'login-form.php' );
nd_login_load_template( 'lost-password-form.php' );
Now go to sb-login/template/tabs.php
Find this:
<ul class="nd_tabs">
<li class="active"><a href="#nd_login_form"><?php _e('Login', 'ninety'); ?></a></li>
<?php if (get_option('users_can_register')) : ?><li><a href="#nd_register_form"><?php _e('Register', 'ninety'); ?></a></li><?php endif; ?>
</ul>
Replace it with this:
<ul class="nd_tabs">
<?php if (get_option('users_can_register')) : ?><li class="active"><a href="#nd_register_form"><?php _e('Register', 'ninety'); ?></a></li><?php endif; ?>
<li><a href="#nd_login_form"><?php _e('Login', 'ninety'); ?></a></li>
</ul>