This would assume that your domain and account is already configured (ie your domain is already pointing to your webhosting account). Upon purchasing a plan from GREATWEBHOST.COM.PH (or any other webhost that uses CPANEL for that matter) you will be given a CPANEL username and password pair for your access to the webhosting administration page ie control panel. In your web browser, access your cpanel by opening this link
http://yourdomain/cpanel
Change yourdomain to the domain that you own ie I access http://greatwebhost.com.ph/cpanel whenever I need to do something with my webhosting account. After typing in your given account, you will be forwarded with what would be your best friend in your web career 
Some things that you would likely need to do while in there
- Change Password
- Update Contact Info
- Index Manager – we would want to disable indexing in our webhosting. If you will view your domain right now, you will be greeted with the index of your web directory. Well we wouldn’t want people to see the files in our web directory unless we really intended to. To fix- from the CPANEL home screen click the icon for “Index Manager”. Select the directory public_html then after choose “No Indexing”.
- Finally, install your desired web application. You would usually want to install Wordpress if you will be using your webhost account for blogging purposes. To do so, click the icon for Fantastico and install wordpress in your web root ie “/”.