Yes, if you want to add the button to login/registration form, you can use the source code below:
function noo_btn_login()
{
$candidate_demo_link = "#yourlink";
$employer_demo_link = "#yourlink";
?>
<div class="noo-login-demo" style="text-align: center">
<a style="padding: 10px 20px;" class="btn btn-primary"
href="<?php echo esc_url($candidate_demo_link); ?>"><?php _e('Candidate Login', 'noo'); ?></a>
<a style="padding: 10px 20px;" class="btn btn-primary"
href="<?php echo esc_url($employer_demo_link); ?>"><?php _e('Employer Login', 'noo'); ?></a>
</div>
<?php
}
add_action('noo_register_form_start', 'noo_btn_login');
add_action('noo_login_form_start', 'noo_btn_login');
Add that custom code to the functions.php file in the theme folder.
Regards.