1. Go to www.swcombine.com
2. Click Join Link.
3. Look over Terms of Usage (or not).
Under the scrolling box with the Terms of Usage, is a disclaimer about Multi-Accounts, and that they are forbidden, except under certain circumstances.
Under that disclaimer about Multis, should be another area. In it are 2 radio buttons (for agree and disagree to the terms) and a 'proceed' button.
Hitting the button will take you to a form, for signing up.