Add screenshot for select gitea app step

docs/vendor/quick-start.mdx

@@ -181,7 +181,13 @@ Before you begin, ensure that you have access to a VM that meets the requirement
 
 1. Create a customer so that you can install the release on your VM with Embedded Cluster:
 
-   1. In the [Vendor Portal](https://vendor.replicated.com), select the Gitea application and then click **Customers > Create customer**.
+   1. In the [Vendor Portal](https://vendor.replicated.com), under the application drop down, select the Gitea application that you created.
+
+      <img alt="App drop down" src="/images/quick-start-select-gitea-app.png" width="250px"/>
+
+      [View a larger version of this image](/images/quick-start-select-gitea-app.png)
+
+   1. Click **Customers > Create customer**.
 
       The **Create a new customer** page opens: