Page Numbering Add page numbering to letters. Before you begin ProcedureTo add automatic page numbering to a letter: From within Letter Writer, select Insert > Page Numbers. In the Page Numbers window: Choose the position of the numbers in either the header or footer of each page. Choose how you want the numbering to be aligned. To include a page number on the first page of the letter, set Show Number on First Page. Click OK to confirm your selections. ResultsPage numbering is applied to your letter.