In P6, it's not possible to have a different footer on page 1 vs. all the rest of the pages. What I do is show a larger footer only on page 1 containing the project name, legend, logos, etc. Then, I have a thin header that shows on all pages that contains the page number, data date, project name, etc.
Another work around would be to print out your schedule in an Adobe .pdf file and insert a footer (page number) onto whatever pages you like. Do not forget to eliminate the page number from your P6 footers. We use this method on a daily basis to publish our schedules.
Hope this helps,