It is very simple. For adding join hubpages link to your profile or anywhere you want, remove "uniquesense" from the link below and replace it with your default tracking token available in your "my account" - "URL trackers" of your hubpages account:
For example, my default tracking token is "3e18e2wvz8nn9". Again if you are not able to understand well, I will make it simple.
Click "my account" while logged on into your hubpages account, then click "URL Trackers" tab beneath the Affiliate Settings tab and copy your default tracking token and replace it in the link above, for example:
Like this. Okay. Best of luck for referring your friends and relatives to hubpages.