You can manage your account information under your account settings.
After you log into your account, click on your name at the top of the page and then click on "Account Settings"
Make sure to save any changes you make by clicking on "save"
*HINT to change your time zone, click on the current time zone and backspace to delete it. Once that is done you should see a drop down menu with additional options, or you can type in your correct time zone to select it quicker.