The TAs will be running office hours via Google Hangouts, as well as answering questions furiously on Sunday through Wednesday nights. The TAs are Ceyhun Alp and Kan Wu and they are both pretty great TAs.
Here is how to contact them to get a hangout and debug something together:
These sessions will generally be available SUNDAY, MONDAY, TUESDAY, and WEDNESDAY evenings.
Of course, if you have problems at other times, email to firstname.lastname@example.org is a good idea.