I had clubbed my Hub pages account with Google Analytics a couple of days ago. You do not need to put the snippet of code anywhere since there is no provision. You just gotta put the tracker ID in the Earning section, where it asks you to connect it to Google analytics.
Follow this - My account ---> Earnings ---> Reporter Settings.
Once you set-up your account, you will have a tracker code to be put in the Reporter settings.
the code will be something like - UA - 12345678-1
Hope it helps...