Directions on how to get to CERN you can find here: https://home.cern/directions
When on CERN site, find your way to the car park behind the Globe. IdeaSquare is there, towards West (France). Google map is here.
For registering your laptop/mobile phone for wifi access at CERN, please fill in a request here: http://cern.ch/registerVisitorComputer - and use Ole Werner or Catarina Batista as the CERN contact person (on the last page of the request form).