title: Change the value of an element in a PFUser Object of type Array, in Swift
body: <p>I'm new to Parse server. 
  First, I create a multidimensional array as an object on Parse server</p>
  
  <pre><code>let day1 = ["one", "two", "three", "four"]
  let day2 = ["five", "six", "seven", "eight"]
  
  let jan = [day1, day2]
  let feb = [day1, day2]
  
  let calendar = [jan, feb]
  
  let user = PFUser()
  user.username = userNameTextField.text
  user.password = passwordTextField.text
  user["Calendar"] = calendar
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/TTmEc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TTmEc.png" alt="enter image description here"></a></p>
  
  <p>What I want is to be able to do a PFUser query and change the value of calendar [ 1 ] [ 0 ] [ 1 ] from "two" to "zero". I've gone over Parse's documentation, but I'm just confused on how I could accomplish this. Thank you for your help!</p>