@benglish. I can’t tell you what to do on your own server. Ask your the administrator (or hosting company admins) to do it. if you are the administrator, and you don’t know how to do it, you should search on the internet on how to do it. There are various tutorials around, even on PHP.net.
Some hosting companies explain how to do it in their wiki. Many of the hosting company admins will do it for you, or explain to you how to do it.