Labels are Word tables. Display the gridlines under the Tables menu. You can
insert a row if you need to and move things around. This is part of the
reason that many experienced Word users use mailmerge for labels. It is a
lot easier to modify and sort data files than it is labels. You might want
to see Graham Mayor's site for his article on doing a mailmerge from
existing labels. You could even do a mailmerge into a table which could then
be used as a datasource for future mailmerge production of labels.