Under the selected domain go to website > Files > Manager. 

Click on Edit Permissions.

After manipulating the file or folder permissions you will be brought back to the file manager.

 

How the permissions work at Umbler

Reading Permissions:

chmod 750 wp-config.php = chmod (owner)(group)(others) wp-config.php

4 + 2 + 1 = 7 (rwx permission for the FTP user)

4 + 1 = 5 (r-x permission for the user/group)

0 = 0 (--- (NO) permission for other users)

Write permissions:

chmod 770 wp-config.php = chmod (owner)(group)(others) wp-config.php

4 + 2 + 1 = 7 (rwx permission for the FTP user)

4 + 2 + 1 = 7 (rwx permission for the user/group)

0 = 0 (--- (NO) permission for other users)

 

Understanding the different permissions

Read permission:

With this configuration, the files can only be read and executed, but not modified. With this read-only setting, changes to the files and folders have to be done using another protocol, like FTP or SSH.

Read/Write permission:

This configuration means that the files contained in your website can be read and modified via programming. Your website can modify its own files. It is usually required that certain files or folders are writable, but not the whole website.

By allowing read/write permission to your whole website, it is becoming more vulnerable to the action of hackers.