Oisin C. Feeley wrote:
In the preamble for the document (LyX->Document->Layout->Preamble) add the
following:
\usepackage{fancyhdr}
\pagestyle{fancy}
\rhead{\bfseries 123456789}
In LyX, only the third line is necessary. In LyX 1.3.x, go to
Layout->Document...->Layout and set the Page style drop-down list to
"fancy". Then go to Layout->Document...->Preamble and add the \rhead
command. In LyX 1.4.x it's Document->Settings...->Page Layout->Page
style and Document->Settings...->LaTeX Preamble, respectively.
/Paul