Site blank?

Hi, I activated your plugin on our site in an effort to make it more secure but its ended up making our website unviewable? I’ve tried loggin in using both the new and old login addresses and it won’t allow me access. I’ve tried this from multiple IP addresses to make sure I hadn’t accidentally added us to the blacklist but nothing help.

Anything you guys can suggest?

https://www.ads-software.com/plugins/better-wp-security/