Thank you so much for your thorough reply. As someone not well versed in code, where exactly should I paste the snippet below?
add_action( ‘template_redirect’, ‘my_login_redirect’ );
function my_login_redirect() {
wpmem_redirect_to_login();
}
I opened the WordPress editor and pasted it into the functions.php file, but the site then wouldn’t load and issued an error warning.