The print server properties have been misplaced a bit in Windows 7. Before, you could right-click in the window showing your printers, then choose the dialog from the menu. In Windows 7, this no longer works, as they've kicked out that particular menu entry.
But all is not lost: it still exists, but is not directly accessible anywhere. You need to use MMC, add the right snap-in, and that one provides you with full acess to the server properties.