If you have a HD receiver try HDMI or component imput but if you don't have an HD receive try ch3 or 4 or video 1 thru 4. To navigate thru your tv inputs you need to push the source/imput button on your tv remote.
being working with dish for about 6 months, basically know why the costumers complain about the bill, and other related issues on the account, know how to troubleshoot, and give the basic details of why they experience signal issues
More likely your TV 1 is going to be on an input, use your remote from your TV and press the input button or from your TV itself, I'd this doesn't work try pressing the TV button On the dish remote next to the sat button and then press input
if your tech did their job you should have stickers on your remote that tells you what input you need. if they didn't put those then they should have at least filled out the quick start guide with those inputs. if they didn't do this either, i apologize as your tech was lacking. look at the back of the receiver and follow the cable from the receiver to the tv to be sure of the input you need to be on.