Troubleshot of installation

1. I can visit the homepage or sign-in page, but I'm unable to sign-in

Generally, it returns 404 error when you click the 'Sign In' button. Two reasons may cause this:

1. .htaccess file in the root directory is missed. If you upload file by file from Windows to the server, it may happen as files start with a dot are hidden in Windows. Or sometimes when you unzip the file using cPanel unzip tools, the .htacess file will be replaced with an improper one. In this case, you only need to upload the .htaccess again.

2. Your rewrite module is configurated improperly. Make sure the rewrite module is enabled. It usually happens when you are using Nginx. You should make sure you configure the rewrite module in the correct configuration file (e.g in '/etc/nginx/sites-enabled/default' or in '/etc/nginx/sites-available/default').

2. How to enable rewrite module in Nginx

1. Open the configuration file: sudo nano /etc/nginx/sites-available/default (or /etc/nginx/sites-enabled/default, it depends on your OS and setting)

2. Finf the part of your site, and replace 'try_files $uri $uri/ =404;' with 'try_files $uri $uri/ /index.php?$args;'

3. Restart the HTTP server: sudo service nginx restart