admin area page not found

hello please i really need help anytime i try to access my admin area at https://www.sportztrendz.com/wp-admin i get this error
Not Found

The requested URL /cgi-sys/bfdenied.shtml was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

and aslo anytime i go to my website and click on anypost it shows this

Not Found

The requested URL /2016/11/08/13-things-didnt-know-antoine-griezmann/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

please i dont know what to do i am very confused any help will be greatly appreciated