To Set the DG-ID on a Yaesu FT300D
Press the GM button for 2 seconds
Press the GM button again, briefly

Turn the dial to set the Desired TX DG-ID
The TX DG-ID shown here (23) will connect the Coos Bay Repeater with the Sherwood Repeater. (Repeater 2 with repeater 3) 32 would also work just as well.
Hold down the GM Button for 2 seconds and you will see the main screen come back. You will not see the change on the screen till you transmit and in the upper right corner of the screen it shows TX 23.
When your done with you link remember to put your TX DG-ID back to 00!