How to "add existing frameworks" in Xcode 4?

I just added the existing framework folder manually into the project navigator. Worked for me.

As per Apple's documentation:

1. In the project navigator, select your project.
2. Select your target.
3. Select the "Build Phases" tab.
4. Open "Link Binaries With Libraries" expander.
5. Click the + button.
6. Select your framework.
7. (optional) Drag and drop the added framework to the "Frameworks" group.

Follow below 5 steps to add framework in your project.

1. Click on Project Navigator.
2. Select Targets (Black arrow in the below image).
3. Select Build phases ( Blue arrow in the below image).
4. Click on + Button (Green arrow in below image).
5. Select your framework from list.

Here is the official Apple Link