Can you change your decision from ED2 to RD? How can I do that?
Why do you want to make the change? There may be a place in the portal to do that, but at this late date (EDII decisions could come out anytime between now and Feb 15th), I would contact your regional AO via phone call and/or email to have your app put in the RD pool.
ED2 decisions were just announced according to the the thread. Did you make your changes?