Begin by navigating to the Security page. You can find this by clicking on your account name in the upper right corner of the page and selecting "Security" from the drop down menu.
When the page opens you should see a similar list on the left hand side and the Security page options in the main window.
Here you can see the age of your password, as well as whether or not 2FA (Two Factor Authentication) is enabled. By clicking on the button labeled "Change" you will be presented with a dialogue box that asks for your current password followed by your new password, as well as a space to re-enter your new password to make sure that you have entered it correctly.
If you have 2FA authentication enabled, there will be an additional field for a 2FA code beneath the others. If you have not enabled 2FA, we strongly recommend it. You can find more information about it here.
Please note that your password must be more than 8 characters, and must include at least one uppercase and one lowercase letter as well as one number and one special character. Your new password should not be the same as your current password. Once you have filled all three fields, click the "Change" button. You will get a message in the upper right corner of the window telling you the password has been changed successfully.