WorldConnect requires "user codes" (sometimes informally referred to as "accounts") for each different tree you upload there.
Of course, if you have only one tree to upload, you don't need multiple "user codes" and when you want to update your tree at WorldConnect, create a revised GEDCOM and upload it and the revised version will appear in place of the original one.
Submitting your family tree (to WorldConnect at RootsWeb) via the Internet is a five-step process.
Step one: Create a GEDCOM-format of your family tree. A GEDCOM will usually end with the extension of .ged (for example, YourFilename.ged).
Step two: Enter your choice of a user code and password for your family tree (there's a form on the WorldConnect help page about how to upload trees).
Each family tree you submit will need a unique user code. User codes are 3-16 characters (letters, numbers, hyphen, or underscore characters only), and cannot contain any spaces. It will be visible, as it becomes part of the address for your family tree. Your password will remain private. If someone else is using the code you select, you will see a notation "Password is incorrect for this user code." Simply enter a new user code should that happen.
Step three: Choose standard or advanced setup. If this is the first family tree you have submitted to the WorldConnect Project, it is strongly recommended that you use the standard option. You can use the advanced setup/edit form at any time later to modify your options.
Step four: The next screen that appears during this process will have your user code at the top. You add your full name and your e-mail address.
Step five: Complete the standard setup or advanced setup forms.