Assuming that you have restarted PT4 any time in the last week or so (you shouldn't leave it running for days on end really - it can affect performance) then it will have downloaded the files needed to work at 888 in NJ.
You can configure it by following
this guide, although I believe that the hand history path should be detected automatically. If you weren't previously playing at 888 you will need to turn on the 'get hands from site while playing' option for 888 though.