This is done under the Execute Script function in the backend system. You much have developer-level access to make this happen. To do so, click Execute Script:
Select "Copy App" from the dropdown menu. Choose whether you want to populate the apps by ID number or label.
To populate an app, it must already be created in an account in our system. Include the account ID and name of the app into the form, then provide the account IDs or labels of where you want the apps to appear.
If you make a mistake, you can always remove apps in the same way and try it again. Avoid doing this during a contest, when it could disrupt merge fields associated with that contest.