To create a new or edit an existing custom component, go to the Library module and select the Custom Components A list of artifacts will be displayed. From this view you can create a new component, review the component's save history, or edit an existing artifact.
Figure 1. Window with the list of custom components and the context menu of one of the artifacts
Preview / Edit
When you go to a specific component, its content will be displayed in the editor. From this level you can start editing the artifact and save its new version.