Tools | Letters and Mailings | Envelopes and Labels. On the Labels tab,
click Options... In the Label Options dialog, choose Avery 5263 and click
OK. In the Labels dialog, click New Document. This will give you a full page
of labels to type on. They are set up as a table, so be sure you have table
gridlines displayed (Table | Show Gridlines) so you can see the label
boundaries.