If the Kenwood software for that radio is similar to others that I've seen or used, the Help file should be quite useful in getting you going. Load up the software, read the radio, unplug (so you don't accidentally write something you don't want back to the radio) and poke around. Learn by doing. You may find that hovering the cursor here and there will give little help windows. If you put the cursor on a field and click on it, you may or may not be able to change the field by typing. Some require up/down or left/right arrow or page up/down to change. Others, you have have to clear the field before you can type in it. Some you have to hit <enter> before you can edit the field.
You might also search on YouTube. There are a great many instructional videos for radio programming software of all kinds. Even if you don't find one for your exact model, the software for other Kenwood's is generally very, very similar in form and function.