Lost control on my blog,Not Logging In now

I installed a plugin called Better Wp Security. I tried to tweak as per the Plugin. I changed login url,and i also changed the name of wp-admin to myfiles. Suddenly i was unable to do anything. Now i can\’t even login into my website.Username and Password is correct. Whenever i am opening my website,i see a bunch of errors. I need your help. I have done silly mistake. But kindly help me.

My website:https://infoxss.com

All my stuff is on stake.

Kindly contact me on [email redacted]