Select that row and make the changes under Format>Cells>Font and Alignment.

Excel alone is poorly suited for creating labels.

Do you have Word?

Use Word's mailmerge with Excel or Access as the data source.

Assuming you are using Word for the mailmerge and Excel for the source see these
sites for help.

http://www.mvps.org/dmcritchie/excel/mailmerg.htm

http://www.mvps.org/word/FAQs/MailMerge/CreateAMailMerge.htm

http://www.mvps.org/word/FAQs/MailMerge/CreateADataSource.htm

Gord Dibben  MS Excel MVP