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I have already resolved it.

Thanks.

How did you resolve the problem?

By adding filter to functions.php

add_action( ‘register’ , ‘register_replacement’ );
function register_replacement( $link ){
if ( ! is_user_logged_in() ) {
if ( get_option(‘users_can_register’) )
$link = $before . ” . __(‘Register’) . ” . $after;
else
$link = ”;
} else {
$link = $before . ” . __(‘Your Title Here’) . ” . $after;
}
return $link;
}

and Header.php :

<?php wp_register( $before, $after ); ?>

Won’t these be lost if/when you update your theme?

No, I create a child theme. I have copied the php file into my directory. So even there is an update, it won’t affect my setting.

Thanks.