Hi James,
Thank you for your question, you are able to jailbreak your device by using several softwares. One of the most popular software using in jailbreaking method is Pangu. Please follow the links I am providing and read these articles, if you still have any more issues then you are welcome to ask your question anytime again.
http://www.iphonearchive.com/ios-8-and-ios-81-jailbreak-announced-by-pangu-team-read.html
http://www.iphonearchive.com/cat/jailbreak.html