Click button Next in the first window of the Publish Asset wizard. In the second window of the wizard you can manage the library content and its documentation.
Section Setting Details on the left side shows the content of the Implementation folder of your service. You can expand and collapse the nodes to display all available items.
The Include checkbox corresponds to the element attribute Include in Library Export: Activate the checkbox for all elements that you want to include in your library.
For a detailed description of how to use the Publish Asset wizard, see Publishing Assets.