Use the following code and replace username with your twitch username and web address with the URL of the website you are going to be installing it on.

https://player.twitch.tv/?channel=username&parent=www.webaddress.com"

E.g. if your twitch sign-in/user name is streamerdude and your website is www.streamerdude.com then you would fill out like the following.

https://player.twitch.tv/?channel=streamerdude&parent=www.streamerdude.com"