Click on the person symbol at the top right corner of the page and select Profile in order to redirect you to the page as you are seeing below:
Here you go in the Password Section and type in your current password and underneath that your new with its confirmation. At the end you just click on the CHANGE button and your password has just changed.
* BE CAREFUL to type in the same password in the New Password and Confirm Password cause differently your password will not change.
** You can also change some of your profile's personal information in the Personal Information Section at the left side of the page and click on the UPDATE button.