Go to your italki profile and edit it. Under 'Basic Information', make sure that where it says 'Living in', you put your current location where you actually live right now. For example, if you are living in Buffalo, New York, United States right now, make sure it says 'United States' in the box on the left and 'Buffalo' or 'New York' in the box on the right.
This is extremely important because otherwise, every teacher's schedule will appear in the wrong way, you will schedule lessons for a time of day that you are asleep or simply not available, and you'll miss lessons. Once you fix your profile location, you won't have to worry about it.
And remember that if you travel and want to take lessons while you are in a different time zone, you will have to change your 'Living in' location so that you book lessons at the right time.