How to cancel Hulu free trial so I can upgrade to live tv.

iTunes settings will not give me an option to chancel, change or add on to Hulu free 1 month trial. Hulu support agent tells me I have to cancel free trial through iTunes and then go to Hulu website using a desktop browser to start the Hulu + live tv for $39.99 free 1 month trial. I went to settings> iTunes> username> password> subscriptions> Hulu. Only options given were ‘confirm’ which subscription. My only choices were the basic for $7.99 or commercial free for $11.99. iTunes is blocking me from the live tv and add ons as well.