Type your first and last name. Use your full name so people with the same first name don't get mixed up.
Click and drag across the times you are free. The times on the left are shown in your time zone, with the organizer's time beside them.
Click Submit availability.
To change your answer later: come back to this link, type the exact same name, click Load my saved availability, make your changes, and submit again. There is no password. Re-entering your name is how you edit.
Your name
Your availability
Group overlap
Drag across the times you are free. Each block covers the 30 minutes starting at the time shown.
Pale blue means fewer people are free. Darker royal blue means more people are free. Hover over a block to see who is free then.