Well that's not quite correct. You should use your referral tracker so that you get credit for getting people to sign up with HubPages.
If you go to my profile page you will see "If you wish to start writing for HubPages, use this link," hover over the bit in blue that says "use this link" you will see after hubpages.com a / followed by _ followed by tinar. Tinar is my referral tracker and you must have the _ to get the credit.
To create a referral tracker go to my account, then earnings, then referral trackers. One complicated one is given, but you can create simpler ones. Then any hubapges page can be turned into a referral page by adding /_tinar (in my case).