Update README.md

README.md

@@ -18,11 +18,27 @@ It will display jQuery data property of a selected element.
 
 ### Manual Installation
 
-1. Clone this repo
-2. Open Chrome extension page
-3. Check "developer mode"
+1. Clone this repo;
+2. Open Chrome extension page;
+    via Settings Extensions or type url: chrome://extensions.
+3. Make sure "developer mode" is On in Extensions page;
 4. Click "load unpacked extension", and choose `atkjs-chrome`.
 
+### Usage
+
+Atk Panel
+
+1. Open the developer tools (View/Developer\Developer Tools);
+2. Look for the ATK panel in developer tools window;
+3. Fire callback request in your atk application.
+
+Atk plugin properties side panel
+
+1. Open the developer tools (View/Developer\Developer Tools);
+2. Select the Element panel in developer tools window;
+3. Look for Atk plugin Properties side panel;
+4. Select an element at the Element panel and the Atk plugin properties panel will display jQuery data
+set to this element.
 
 
 ### License