You should be able to- but just be aware, the system is notorious for not working peoperly all the time. For my last round of ADRs, the sytem would only let me do that first 180-day, and nothing further, despite having put in my confirmation. When I came here to find out more, I discovered lots of people who experienced the same thing. That site can be very frustrating. Hopefully you won't experience any problems! Good luck.