Correct me if I'm wrong...
The tracker is used to credit you for those who have created accounts, and Hubs after clicking your tracker. But before this you would need to establish an account with one of the HubPages earnings programs or one of the External Affiliate Programs first.
As stated on the "My Referral Trackers" page:
"All earnings from the tracker program are credited directly to your AdSense, HubPages Ad Program, eBay, and Amazon affiliate accounts. Traffic views accumulate when somebody that clicked on your tracker views any Hub."
So, I would say "No". I don't think a referral tracker can be assigned to you without joining one of the programs before hand. The tracker program is an additional way to earn at HubPages. I would also like to add that all you need to do is join HubPages, Create Original content, post them, and watch your traffic and your earnings accumulate. I think this is the easiest and sooner way of earning.