Use the URIExplorer to navigate to the the project to which you want to add a library. Then navigate to the project property page in one of the two ways:
Right-click on the project and select Properties from the pop-up menu
Left click on the project, or on any file within the project, and from the main menu select Project > Properties
Select the libraries you wish to add from the box on the right and click the small arrow in the center of the dialog pointing left. If you want to remove a library from the project, select it on the left and click the arrow pointing right.
Finally, click OK and see that the library has been added to your project in the URI Explorer.
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Editing a SWeDE Library
Configuring SWeDE Library Preferences
Exporting SWeDE Library Contents