There are two ways to access your account to change your password.
You may access “Security” settings at the top right.
On the left hand navigation pane you can access “Settings” -> “Change Password”
Where you will be take to your account password page to change the password.
Input your old password in the ‘old password’ field and enter the new password exactly as they are in both the ‘new password’ and ‘confirm password’ fields.