Time zones
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You can change your time zone by first clicking the main menu in the top left--then click "Users." From the user list, find and click on your name. Once inside your profile, select your time zone.

Role Changes
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If you are an admin, you can change other users' roles.

From the user list, click on the user name and then edit the "Type of User" box (demonstrated in the picture below).

Make sure to remember to save your changes :-)