PL is typically set as the "Tone" (CTCSS). Some radios show this as a "T". This is needed for FM on non-Yaesu rigs.
DG-ID code is 14 and is found under the GM settings on Yaesu rigs. This is used for both RX and TX digital modes. Default is 00, so changing this is required.
- refers to the negative offset frequency. It is 600KHz below 145.170 or 144.570 MHz.
Setting a negative offset will set your rig to transmit at 144.570 MHz.
These settings are necessary in order for your transmission to be heard by repeater users.