You need to set up a device template for your tv. After you have one, it will be an available option in the wizard.
To do this, log into the web admin by typing 192.168.80.1 into a web browser, then log in.
There are a few ways to do this, but i nomally go to Advanced->Configuration->Device Templates.
Now use the drop-down to select the manufacturer of your TV, then select the category of Tvs/Plasmas/LCDs/Projectors < AV, and hit Apply filter. Now you can look at all of the choices for that manufacturer in the Device Template drop down to make sure your tv isn't on the list. If it isn't, then hit the Add Device Template to make a new one. Simply fill out the information in the wizard that follows - its actually pretty easy once you've done one.