Once you have successfully logged in you may go to: My Account > My Profile > Edit Profile (located under the box with the head outline) > Manage Account > Manage Password. 

You will enter Current Password > New Password (minimum of 8 characters) > Confirm Password > Change Password located in the blue box. 

If successful, you will receive an e-mail confirming you have changed your password.

If you are having trouble logging in and have forgotten your password please check out how to reset your forgotten password.