I booked this morning. Signed in at 5:55 am eastern with my password, selected a restaurant (BOG), and under 'check availability' the dates for my trip were all showing, so I clicked on a date, dinner (then on the drop down under dinner picked a time), # of people, and waited until the clock hit 6:00 to hit 'find a table'. It came back with 2 times available and I clicked on one to reserve it.
The next page asked who in my party was dining with me, then the next page asks for the CC information. There was also a page to list a contact phone number and accept the terms. After I got that one I went back to choosing the others I wanted. Let me know if you have any more questions!
Make sure you sign in ahead of time, my page says 'Hi Georgina' even though I have not officially signed in. Click on the 'Hi, whoever' and it will ask for your password.
We are only a party of 2, but checking around now there seems to be availability at most places other than BOG. Of course, Dec 12 starts a new
free dining period so tomorrow may be busy at reservations. Good luck!