Updating documentation

README.mkd

@@ -61,12 +61,13 @@ Basic Usage
 
 Let's get everything set up first. You'll need to give `parse_rest`
 your Application Id and REST API Key (available from your Parse
-dashboard) in order to get access to your data.
+dashboard) in order to get access to your data. All calls to Parse are
+done through ParseBase classes, so we need to register the credentials
+with it.
 
 ~~~~~ {python}
 import parse_rest
-parse_rest.APPLICATION_ID = "your application id"
-parse_rest.REST_API_KEY = "your REST API key here"
+parse_rest.ParseBase.register(<application_id>, <rest_api_key>)
 ~~~~~
 
 To create a new object of the Parse class `GameScore`, you first