In order to update your profile, you must be logged in using your userid and password. After you log in, you will see a “Howdy, [your name]” item in the upper right corner of the page.
“Hover” over “Howdy, [your name]” and you will see “Edit My Profile”. Click on “Edit My Profile” to be taken to your profile page. Depending on your security levels, you will be able to modify different items.
For example, if you page down you will see where you can change your password. When selecting a password, remember that it is a balancing act between secure and easy to remember.