This is Jonathan from Kontera. You can use your existing publisher ID on your HubPages. We explain how to do it here: http://kb.kontera.com/questions/100/How+do+I+imple...
However, we recommend that you e-mail us first at email@example.com so we can generate a unique Kontera tag for your HubPages.Otherwise, if the same Kontera tag is running on two different sites, it might confuse our algorithm, and hurt your earnings.
- Jonathan Cohen
Kontera Community Manager