I finally called Xfinity tech support. The solution is to create a set of Rules on the Xfinity Home Security website that tells the thermostat when to adjust the heat and the desired temperature. (You will see the Rules drop down menu on the website after you log in.) Then put the thermostat in Simple Mode and the Xfinity wireless pad will control the thermostat using the rules created.
And my heating program is now working. Thanks everyone for your help.