Installing an app
Public sites
You will be able to install featured apps from the marketplace only for your site. To install an app
Click on Apps tab of your Site's dashboard
Click on Install App
Select the app you need to install
Sites on Private bench groups
You can add custom apps or any app from the marketplace to your bench group and then install to your site. To install an app on a site on private bench group you have to add app in 2 places.
Bench Group
Click on Apps tab of your Bench Group's dashboard
Click on Add App
Select any marketplace app or follow this guide to install a custom app.
Click on the Update Available button to create a new deploy so that your site can install the app
Select your site while doing the update and click on deploy and update
Site
Once the update is done click on Apps tab of your Site's dashboard
Click on Install App
Select the app added earlier to install