|Administering the Community / Managing Add-ons and Apps|
If you want external contributors to your community to be able to use an add-on, you can enable access.
The setting to enable external contributor access is only visible if your community has enabled externally accessible groups under. All external contributors in your community will be able to access an add-on you enable: you can't restrict access to members of specific groups.
Apps that are bundled in add-ons will be displayed in the App Launcher when external contributors click the Apps tab.
To enable an add-on for external contributors: