BWPS Can't Login

I have read the other threads on accessing your site after hiding the backend with Better WP Security. I have looked at my .htaccess file and tried both the slug I set up and the secret key–no matter: I keep getting a 404 error.

My site is lindenamueller.com/blog/. I am using Powweb as my host and Firfox as my browser. I’m not sure what version of WP I have, as I can’t log in to check. Please help… I have taken a blogging break, but I am ready to get back to it!