Better WP Security Plugin—Cannot log in to admin!

I’ve been using the Better WP Security plugin for a while without any problems. I’m not very savvy with my site’s back end, and while I was adjusting some of the settings this morning, I opted to “hide back end” to protect against bad login attempts.

The problem is, I didn’t realize that this would change the link I had bookmarked, I just thought it would show something different in the browser bar. My site is just fine, with not errors; but when I go to my admin login page, I get a 404 error.

I have no idea how to fix this or what I can do, since I can’t access the back end of the site in any way. Please help!