Update test-bed.mdx

Author: louisgv

src/pages/itero/test-bed.mdx

@@ -39,6 +39,12 @@ Take the zip file that you created in the previous step and upload it to Itero.
 
 Once you've uploaded your extension, share the generated link with your beta testers. They'll need to install Plasmo's software, but after that, they can install your extension with a single click. As you make changes, the updates will automatically be pushed out to them.
 
+To get the Extension's Link, open the drop-down item for your Itero extension, then click Install Page:
+
+![Extension Item](https://github.com/PlasmoHQ/docs/assets/6723574/ffcdc068-5d49-4aa8-ab44-1a71562e0bb4)
+
+Share that URL with your tester. If you would like the extension to be accessible to just your team, switch its access to "Private."
+
 ## GitHub Integration
 
 If you're using GitHub to manage your code, Itero TestBed can be integrated with it. This allows you to automatically deploy your browser extensions to Itero TestBed when you push to your GitHub repository. Visit the [GitHub Builder page](./builder) page for more information.