Mention where to locate the block instead of how to install it (#146)

README.md

@@ -79,14 +79,11 @@ potentially diverse audiences.
 Enabling in Studio
 ------------------
 
-You can enable the Drag and Drop XBlock in Studio through the Advanced
-Settings.
-
-1. From the main page of a specific course, navigate to `Settings ->
-   Advanced Settings` from the top menu.
-2. Check for the `Advanced Module List` policy key, and add
-   `"drag-and-drop-v2"` to the policy value list.
-3. Click the "Save changes" button.
+Drag and Drop v2 XBlock is already included in Open edX.
+
+You will find it in `"Add New Component"` box in Studio:
+click the green `Problem` button, choose the the `Advanced` tab
+and choose `Drag and Drop`.
 
 Usage
 -----