When we were there in August, I just went up to one of the DVC booths at Epcot and asked about scheduling for the day I wanted.
They registered me and that was it! It was a great way to escape the heat of the summer for us and it was our move day from BCV to BLT so it took up some of that time as well.
You need to set that up with the DVC Sales office. The number on the signs is for DVC Sales. You could probably call your Guide and ask them to get you signed up.
Although I made the actual appointment while I was at Disney (DTD to be exact) I did speak with a DVC rep before I even left home! I could have made an appointment then but I was not sure what our days would be like. (I am a planner but not too crazy at Disney since things are subject to change). Go to the DVC website and they will be able to set you up for something I think. I went from live chat then the woman on the live chat gave me the number to contact her and I did (It was like midnight, I am a night owl so they really are available a LOT). I am sure they could help you at any time.