Using Zenith, & assume same for Insignia.
Select subchannels directly:
Double digit station subchannels can be entered directly. Example 223 is 22-3.
In some cases it is possible to go to a double digit station by entering a single digit. For example if you do not have Ch.4 & do have a double digit station starting with 4, entering 4 will go to the double digit station starting with 4.
Single digit stations use the dash at the bottom of number keypad to select...