The VBA editor is essentially the same for all VBA enables Office applications so it would be essentially the same as that shown at
http://www.gmayor.com/installing_macro.htm.
Extract the two files from the zip.
Press Alt + F11 to open the VBA editor, then from the File menu > Import File and select the file frmRunRules.frm from the zip. This will import the form to the VBA editor.
From the Insert menu select 'Module' and then paste the short macro from the first reply into that module.