You can manage your profile via the left-side Profile menu as shown below.
Here you can view your profile, edit it, as well as change your password.
To edit your profile, click on the Edit Profile link:
Once you have completed editing your profile, click the Edit Profile button above to save changes.
To change your password, click the Change Password link in the left menu
You will be prompted for your current password, and will then need to enter your new password and re-type the password to verify. When completed, click the Change Password button to save.