Finish #59 (or at least, I hope so)

Author: abeisgoat

codelabs/chat/README.md

@@ -369,11 +369,7 @@ First add a button to the top right of activity_main.xml
 
   ![main_activity.xml with login button](images/6_2.png)
 
-Extend FirebaseLoginBaseActivity
-
-Although extending `ListActivity` was useful earlier, when it saved some lines of code, it's now more important that we extend `FirebaseLoginBaseActivity`.
-
-We'll change our `MainActivity` definition to extend `FirebaseLoginBaseActivity`.
+We'll change our `MainActivity` definition to extend `FirebaseLoginBaseActivity`. This allows us to make use of FirebaseUIs headful auth in the easiest way.
 
 ```java
 public class MainActivity extends FirebaseLoginBaseActivity {
@@ -397,7 +393,7 @@ listView.setAdapter(mListAdapter);
 
 ![Update FirebaseListAdapter code](images/6_3.png)
 
-Finally we need to add a few event handlers onto `MainActivity` so we can react to login events.
+We'll need to add a few event handlers onto `MainActivity` so we can react to login events.
 
 ```java
 @Override
@@ -418,7 +414,7 @@ protected void onFirebaseLoginUserError(FirebaseLoginError firebaseLoginError) {
 
 ![Add Firebase event handlers](images/6_3.5.png)
 
-Enable Password Authentication
+Then we can enable an auth provider. In this example we'll just use `PASSWORD` but social providers can be enabled here, too.
 
 ```java
 @Override
@@ -430,7 +426,7 @@ protected void onStart() {
 
 ![Enable PASSWORD auth](images/6_4.png)
 
-Wire up login button
+We want our users to be able to click a button to be prompted to log in, so we'll wire up the button we added a moment ago to call `showFirebaseLoginPrompt()`.
 
 ```java
 Button loginButton = (Button) this.findViewById(R.id.login);
@@ -451,6 +447,10 @@ Now go into your Firebase Dashboard and go to the Auth tab and select "Email/Pas
 
 This is also where you can configure the password reset emails that you can send to your users, in case they forgot their password.
 
+Now run your app and click the Login button and you'll see the FirebaseUI dialog. When a user logs in the event handlers we added on our activity will be called and you can interact with their authentication data however you want.
+
+<img alt="Chat login" src="images/0_1.png" height="600">
+
 ## Wrap-up
 
 Wrap-up