NEED HELP

Sir i want to ask for help because there is a problem on my wordpress, when i want to login the initial appearance is different and after i try to enter the id and password appear info 404 on the screen.

after that ill try to check to my site and I tried to check it directly through the website, and what I saw on the website also changed completely broken

can you help me, so i can use it again

The page I need help with: [log in to see the link]