Update README.md

Author: intitni

README.md

@@ -14,7 +14,9 @@ Thanks to [LSP-copilot](https://github.com/TerminalFi/LSP-copilot) for showing t
 - [Permissions Required](#permissions-required)
 - [Installation and Setup](#installation-and-setup)
   - [Install](#install)
+  - [Enable the Extension](#enable-the-extension)
   - [Sign In GitHub Copilot](#sign-in-github-copilot)
+  - [Setting Up OpenAI API Key](#setting-up-openai-api-key)
   - [Granting Permissions to the App](#granting-permissions-to-the-app)
   - [Managing `CopilotForXcodeExtensionService.app`](#managing-copilotforxcodeextensionserviceapp)
 - [Update](#update)
@@ -58,18 +60,26 @@ Then set it up with the following steps:
 
 1. Open the app, the app will create a launch agent to setup a background running Service that does the real job.
 2. Optionally setup the path to Node. The default value is just `node`, Copilot for Xcode.app will try to find the Node from `/usr/bin:/usr/local/bin`. If your Node is installed somewhere else, you can run `which node` from terminal to get the path.   
-3. Enable the extension in `System Settings.app`. 
 
-    From the Apple menu located in the top-left corner of your screen click `System Settings`. Navigate to `Privacy & Security` then toward the bottom click `Extensions`. Click `Xcode Source Editor` and tick `Copilot`.
+### Enable the Extension
+
+Enable the extension in `System Settings.app`. 
+
+From the Apple menu located in the top-left corner of your screen click `System Settings`. Navigate to `Privacy & Security` then toward the bottom click `Extensions`. Click `Xcode Source Editor` and tick `Copilot`.
 
-    If you are using macOS Monterey, enter the `Extensions` menu in `System Preferences.app` with its dedicated icon.
+If you are using macOS Monterey, enter the `Extensions` menu in `System Preferences.app` with its dedicated icon.
 
 ### Sign In GitHub Copilot
 
-1. In the app, refresh the Copilot status (it may fail for the first time, try at least one more time). 
+1. In the host app, click GitHub Copilot to enter the GitHub Copilot account settings. 
 2. Click "Sign In", and you will be directed to a verification website provided by GitHub, and a user code will be pasted into your clipboard.
 3. After signing in, go back to the app and click "Confirm Sign-in" to finish.
 
+### Setting Up OpenAI API Key
+
+1. In the host app, click OpenAI to enter the OpenAI account settings.
+2. Enter your api key to the text field.
+
 ### Granting Permissions to the App
 
 The first time the app is open and command run, the extension will ask for the necessary permissions.
@@ -100,8 +110,6 @@ Alternatively, You can use the in-app updater or download the latest version man
 
 If you are upgrading from a version lower than **0.7.0**, please run `Copilot for Xcode.app` at least once to let it set up the new launch agent for you and re-grant the permissions according to the new rules.
 
-If you want to keep track of the new releases, you can watch the releases of this repo to get notifications about updates.
-
 If you find that some of the features are no longer working, please first try regranting permissions to the app.
 
 ## Commands