When the Rx powers on the LED will light red then start blinking red. At that point you should hold the prog button down until the LED turns off then green. Same procedure with the TX which should be on first to bind, except the Tx will start flashing orange when it is ready to bind. To get into programming mode to change the power setting you have to hold the prog button down for longer than 7 seconds with the Rx powered off or vice versa. By default the module is set at the highest power setting, can I ask why you are trying to change it?