Margaret: you have to set up an account (login name and password) once you get on the site, and there is a charge per event. You have to pay in advance and you check whether you have all the software you need ahead of time.
The dates of each event is posted on the site but I did not see the times. Btw, I asked them how long you could watch the non-live videos for and was told "24 hour from the start of first viewing of that programme".
Hope that helps!
M.