I think that last year's registration details probably work this year too. If so, you've probably already received an email from AGU with all the links. If not, you can register and logon to AGU On-Demand here. (Let me know if that link doesn't work for you.)
You can browse and search the scientific program ahead of time. The search button is on the top right, easy to miss.
Cool features at AGU On-Demand 2016
There are lots of features this year. You can create an agenda for yourself; add reminders to your calendar (maybe only if you use Outlook, not sure); have times for on-demand sessions in your own local time (set this in your profile after you've logged in); you can ask questions of the presenter during a live presentation. They might even get answered😊
Click the help button in the AGU On-Demand window if you get stuck, and post a comment, question or tip below and someone's bound to be able to help out. Check the menu up the top of the screen, which is fairly self explanatory. The Channels have user-friendly names this year, with Climate listed first.
It would be great if, in the comments below, you can list some of the sessions you think will be good to watch, including poster sessions that will become available over time. That includes all you lucky people who are there at AGU16.
Enjoy the latest and maybe greatest science.