OP is trying to do online check-in.....not get dates.
I've stopped doing online check-in. I've found that if I want to change sites from what they've put us in, it's less of a hassle......docs have to be reprinted, resort ID's have to be redone, etc. In other words, don't stress. It doesn't take that much longer to check in once you get there.....especially this time of year. The kids love walking in to check in with me while DH goes to unload the trailer in the overflow area.