title: Updating Meteor.users
body: <p>I've created a form for users to update their profiles. When I submit the form I'm receiving a [403] error.</p>
  
  <p><code>Not permitted. Untrusted code may only update documents by ID.</code></p>
  
  <p>My question is, if I'm going to use <code>Meteor.users.allow</code>, where - in what file/directory - do I write this code?</p>
  
  <p>Thanks,
  Nathan</p>