I've got a bunch of miles saved up through United Mileage plus and would like to try to use them to upgrade the ORD-WAW flight from economy to business. However, not only can I not find any information on the LOT website about how to upgrade the tickets, I can't get the LOT website to list the Fare Code information when searching for tickets (e.g. so that I can tell whether the listed tickets are Y/B code).

Does anyone have any experience using star alliance miles on LOT and have any suggestions?