In the upper right corner of the home page, you will see your name and your profile photo next to it. Click the profile photo and select Edit Profile from the menu.

Edit Profile will take you to a page that contains your basic information. Scroll until you see the button Change Password. Click Change Password and fill in the two text fields: one with your old password and the other with your new password.

When you have entered your old password and new password, click Save Password. If you decide that you do not want to change your password you can click Cancel and your password will remain unchanged.