// if the user is logged in, set their userId and userProperties

if(userId){
  var userProperties = {
    'joined': '04/15/2015',
    'plan': 'Monthly', // options are Monthly, Yearly, Trial
    'payment amount': , // options are 0, 19, 149 (maybe others?)
    'username': 'jpetey7',
    'email': 'jakedpete@gmail.com',
    'first name': 'Jake',
    'last name': 'Peterson',
    'user type': 'Enthusiast' // options are Enthusiast, Teacher, Teacher in Training
  }
  amplitude.getInstance().setUserId('USER_ID_HERE');
  amplitude.getInstance().setUserProperties(userProperties);
}