from the TMP DVD Author start screen, go to Start New Project, then Add File, browse to your MPEG file. click open. If your MPEG file isn't MPEG2 or a compliant stream, you will get an error message from DVD Author, and you need to use a different program. If you don't get that message, your file is loaded.
On the new window that pops up with your file loaded, click Cut-Edit and Chaptering. Go to Fast Chaptering, and select Insert chapters at specified intervals. I use 3 minutes per chapter. Click OK and the chapters are inserted while you watch. Click OK and go to Menu tab. There are too many options for me to walk you thru them all, you may not even want a menu if there's only the one track. Click output and select the directory where you want the DVD folder to be created. If you want, the program will even automatically burn the DVD for you after it's compiled.
Hope this helps.