Welcome to the forum, link is now working. If you have a large enough blower, you can put the multiport on "recirc" and blow everything via the skimmer (if you go with A, you'll only get the suction lines). If you lower the water below the skimmer mouth and attach the compressor to the skimmer pipe with the mp on recirc, you'll blow across the system and clear all the lines (pull the 2 pump plugs before doing this or you'll just push the water in the pump through the lines). The returns and polaris port will start to bubble, when they have a good steady airflow, plug them (you will get wet doing this!!), then the MD will start to bubble, go to the Jandy valve andshut off the MD side with the air still on - then turn off the compressor, add antifreeze to the skimmer line and install the Gizzmo.
Winterize is the setting to use once the lines are blown out to prevent the unit from getting damaged by any water still in it or from having the gasket 'bond' to the pressure plate and rip at the first turn next spring.