Thanks for posting this thread.
I also forgot that I’d changed my .htaccess and opted to make my wp-admin hidden.
I don’t fault the plugin, I forgot to save what I’d changed it to (and I shoulda known better)
following the suggestions given by jujole, I removed the lines of code in .htaccess that clearly were mods made by WP Better Security
and deleted the WP Better Security directory via FTP
and I can now login to my site again
I plan on reinstalling the plugin but pay closer attention to what I changed the login url to
Thanks jojole!