You can update your password to a new one by following a few simple steps!
Step 1: Log in and go to the "Settings" section (you'll find the link by clicking on your username at the top-right of the screen)
Step 2: Here you can enter your old password and your new password as shown below and click on "Update Password" to save the changes.
Step 3: You're done. Try logging out and logging back in to verify the change.