Redirect Login URL

Glad to help. There isn’t a plugin setting for it, but you can add the following code to your theme functions.php file (or add as a custom plugin):

function usp_customize_login_required_message($message) {
	return '<p>Please <a href="https://example.com/wp-login.php">register</a> to submit content.</p>';
}
add_filter('usp_require_login', 'usp_customize_login_required_message');

Then you can edit the href value as desired. FYI this technique is documented at Perishable Press.

Thanks

After making the suggested changes, I am now getting this error and can no longer login using the plugin pages.

Warning: Cannot modify header information – headers already sent by (output started at /home/storyproject_xyz/thelifestoriesproject.com/wp-content/themes/suevafree/functions.php:1) in /home/storyproject_xyz/thelifestoriesproject.com/wp-includes/pluggable.php on line 1216

Any ideas?

Looks like your theme is doing something special with PHP and/or how it outputs HTML. You need to ask your theme developer the best way to add a small custom snippet. They will best be able to help you implement the technique.