To change your password you first need to head to your settings page as a logged-in user. Click the Settings option under the profile icon in the top right corner.
Next, choose Security and then Change password under the Password tab.
Alternatively, you can access this page directly using the button below.
You need to fill in your current password to be able to create a new one. Read this article if you've forgotten your current password and you're not able to log in.