I’m locked out (wps-hide-login)

I installed wps-hide-login on my site, gave the /wp-admin/ page a new name, and it worked fine.

It’s working on other sites I have, also.

I built the site almost a year ago, and haven’t attempted to log back it until now.

However, on this one site it’s not working now, and I’m LOCKED OUT.

When I attempt /wp-admin/ I’m redirected to the site’s home page.

When I attempt /codeword/ (representing the name I gave the page) I’m redirected to a 404.html page.

Any insights?

How can I hack in, remove the plugin, restore the site operation?

Thanks, Ted

P.S. The site is functioning fine, but Norton is giving me a bad rating, so I need to get in and modify things.

The page I need help with: [log in to see the link]