You can click and shift/click to select several rows.
When you've selected the tracks, click on the big Info button on the left to edit common fields like Album, Genre and so on.
Note!!! There's a bug in the latest version 1.6.2, the Album field updates the Artist field!!!
See this thread: http://pioneerdj.zendesk.com/entries/21928697-make-a-change-on-album-and-it-wipes-out-artist-info-come-on