I've selected the letters that match the terminals from my old thermostat but the colors shown do not match the colors of wire I have?

If the color of a wire does not match the color displayed next to the letter of the terminal you have selected in the Lyric app, simply touch the color selected and a menu of colors will be provided. Then select the color that matches the wire you have in your system. Note that the terminal label does not stand for the wire color.