1. Open the pull request in a codespace, as described in "[Opening a pull request](/codespaces/developing-in-codespaces/using-codespaces-for-pull-requests#opening-a-pull-request-in-codespaces)."
2. In the Activity Bar, click the **GitHub Pull Request** view. This view only appears when you open a pull request in a codespace.
  ![Option to open PR in a codespace](/assets/images/help/codespaces/github-pr-view.png)
3. To review a specific file, click the **Open File** icon in the Side Bar.
  ![Option to open PR in a codespace](/assets/images/help/codespaces/changes-in-files.png)
4. To add review comments, click the **+** icon next to the line number. Type your review comment and then click **Start Review**.
  ![Option to open PR in a codespace](/assets/images/help/codespaces/start-review.png)
5. When you are finished adding review comments, from the Side Bar you can choose to either submit the comments, approve the changes, or request changes.
  ![Option to open PR in a codespace](/assets/images/help/codespaces/submit-review.png)