There is no adjustment.
To get to your Dish Settings Go up to the Cox on the top right and then from the menu select DISH settings which will take you to the DISH settings screen.
If you notice looking around there, no matter what kind of TV you have it will report it as a 480i TV, which is a bug. The boxes actually send out the highest resolution that your TV supports. Ignore it says 480.
As far as the WIFI goes, if you have the Wireless Joey 4, I find the wireless reception to not to be as good as it was on previous Wireless Joey devices. But this is beta software so perhaps it will be something that can be improved upon when we are on actual production software.
I wish I had my Macbook here with me, as I have screenshots and videos from the units which would help me show you where things were. I actually purchased a new capture setup which can capture up to 4K resolution over HDMI to do this.