After you have built your feature using the update site editor and all the archives are in the right places, you can preview it in-place using the Update Manager.
1. Open the New Install Wizard via Help > Software Updates > Find and Install...
2. Select Search for new features to install.
3. On the Update sites to visit page, use the New Local Site... button to locate the update site you have created. Expand it to see and select the category you created. Click Next.
4. Verify that the feature you created has been located by the Update Manager. Proceeding beyond that point in the Install Wizard will go through the steps of the actual installation, which is not the focus here.