Help:Screen:SeriesBibliography
When a title is displayed, if it is in any series, a link will appear to the series at the top of the title display screen. See Pawn of Prophecy, for example, which shows "Series: Belgariad" at the top of the screen.
If you click on the series title, a bibliography of all works in the series will be displayed. A link will appear in the left navbar, labelled "Series Data"; clicking on this will take you to the Series Editor.