On the AppGallery home page:
1. On the menu bar, click Collections.
2. Click on the Collection to which you want to add an app.
3. On your collection's page you can chose to Collection from Apps or Add a new app.
4. If adding Existing Apps:
a. Click on the Collect from Apps field.
b. Choose one or more apps from the drop down.
b. Click Save.
5. To add a new app:
a. Click Add new App.
b. Follow the instructions for Uploading an app.
6. Learn how to add a Marketplace app to a Collection.
7. After an application is added to the Collection, you can specify app admin settings, if desired.