A Paragraph is a text line up to the line return. Thus, "Insert paragraph numbers" is really "Insert line numbers".
To "Insert line numbers":
1.Switch to print layout view.
2a.click 'Edit', click 'Select All'
2b.if you do not want all lines numbered, select the contiguous lines you want to number.
3c.To add numbers to sections already in the doc, click in each section you want to number (for section 2 thru n, hold down Ctrl).
4. click 'File', click 'Page Setup', click 'Layout' tab.
5a.If you're numbering all the document (i.e., you clicked 'select all' in 2a above), proceed to step 6.
5b. If you're numbering parts of a document, in the .Apply. box, click 'Selected text'.
6. Click 'Line Numbers'.
7. Click in the 'Add line numbering' check box.
8. Select the numbering options you want.