You can use any editor suitable for you. Nano or vim. In the example below, we are using vim.

# vim /etc/httpd/conf.d/phpmyadmin.conf

Use this code:

<Directory "/usr/share/phpmyadmin";>
		Order Deny,Allow
		Allow from 192.168.10.
		Allow from 127.0.0.1
		Deny from all
		Options FollowSymLinks
        DirectoryIndex index.php
        AllowOverride All
</Directory;>

.htaccess File configuration
Now we need to setup .htaccess file in order to allow the user(s) to access phpMyAdmin login page

# cd /usr/share/phpmyadmin
# vim .htaccess

Use this code:

AuthType Basic

AuthName "Restricted Files"
AuthUserFile /usr/share/phpmyadmin/passwd
Require valid-user

Here is the definition of each line above.

AuthType: refers to the type of authentication that wil be use to check the password
AuthName: text that will be displayed at the password prompt and you can Put anything
AuthUserFile: path for file password / will create next step
Require valid-user: tells the .htaccess file that only users in password file to access it.

Create the passwd file
Use the htpasswd command to create a passwd file. Choose the directory of our choice to save the file. This file is not accessible from a browser.

htpasswd -c  /usr/share/phpmyadmin/passwd user-name

-c command is used to create new file.

Now restart Appache service

Once the above steps are done it requires to restart Apache Service using following command:

For CentOS 5/6:-
# service httpd restart
For CentOS 7:-
# systemctl restart httpd

Check your access to phpMyAdmin on the browser

http://192.168.10.40/phpmyadmin/

Note: Plesuse your IP or qualified domain name on the browser.