Installing plugins

You should add the following code with your FTP details in wp-config.php

define( 'FTP_USER', 'username' );
define( 'FTP_PASS', 'password' );
define( 'FTP_HOST', 'ftp.example.org:21' );

Other thing you can do is give full permissions to the current user so that wordpress can automatically create folders and files in wp-content/plugins

Run these two commands with www-data replaced with your username and
wordpress replaced by the path to your wordpress installation.

chirag$ cd /var/www
chirag$ sudo chown -R www-data:www-data wordpress

Gave it 0755 permission to the wp-content and all it’s subdirectories I still get the same error “write to” message.
The thing you suggested adding to the file I already tried.

Have you checked who is the owner of the directory and which user is trying to upload the plugin files into wp-content/plugins directory. Are they same ?

How do I do that in CentOS? I think there is only the Root user as I have not made any other users.

Please try adding

define('FS_METHOD', 'direct');

this to your wp-config file ?

That allowed the FTP host to work now ??
However there is still an issue with allowing it to right.
https://i.imgur.com/9eSZ9pG.png
Also here is a screenshot that only the root is using it: https://i.imgur.com/jQ9tY3o.png

Fixed:
To anyone else having this problem add this to the end of your wp-config.php file:

define( ‘FTP_USER’, ‘username’ );
define( ‘FTP_PASS’, ‘password’ );
define( ‘FTP_HOST’, ‘ftp.example.org:21’ );
define(‘FS_METHOD’, ‘direct’);

(fill in the FTP details with yours)

then chmod 755 to the wp-content directory using this command:
chmod -R 777 /dir1/dir2/dir3/wordpress/wp-content/