Zoom to 15+ to see parcel lines. Click a parcel to select (Ctrl/⌘-click adds to selection). Shift-drag draws a box to select multiple.

Saved parcels live in target lists (a parcel can be in many target lists). Open a target list's Members to see details, status, tags and notes. Campaigns mail to their linked target lists.

A campaign mails one design to the de-duplicated targets of its linked target lists (plus any added directly).