After installing Drupal 8, I can't input anything on the website.

Hello everyone!

I installed D8 perfectly(I think so), but when I tried to edit the profile(or create a basic page), I input some message and clicked the “save” button, nothing saved and the page was still the original one. Also if I logged out, I can’t log in. After I input the correct username and  password and clicked “login”, the page was still the login page and there’s no error message.

I re-installed several times but nothing changed. What should I do?

Thanks!

Drupal version: 


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