With the two sections below these instructions, you can see that it is a snap to modify almost "any" of your registered information. If you don't see the input forms below, that probably means you're NOT LOGGED IN!
Because the database system is loaded with your USERNAME, and it is KEY to the proper record, it's one of the items that cannot be changed. But, you can see, that your address, phone, name, and even password, can be changed in this one screen.
Simply make the appropriate modifications and click on the UPDATE button below the fields to confirm your changes. Because the personal data and password are very separate items, you need to change them separately and use the appropriate UPDATE button to confirm each section.