They will post pictures of the corals in the live sale thread, usually 1 to 5 at a time. Each picture will include a link to their site where you can add the coral to your shopping basket and check out. The coral is not yours until you have completed the transaction. There are hundreds of people following the thread so you have to be very quick, there is no time to "think about it". As I've stated in other live sales, if you aren't winning all the corals you want, please don't get frustrated, or at least don't post it here. I've seen people get banned for things they say in these live sale threads because they are upset they can't win any of the corals. These sales can really be fun if you don't get emotional about not getting everything you want.
Cherry Corals did a live sale back in June of this year. I think it is back a page or 2 in this section. You might want to find that thread and read a few pages to get familiar with how it works and what goes on. I'm sure there will be all sorts of contests during the sale.