You can use a calculated field for this. In your footer, create a field like this:
{ IF { PAGE } < 5 "" { PAGE } }
This will display nothing for page 1 and page 2 (i.e. page < 5), and then start displaying for page 5 and further.
To create it, use Alt-F9 to toggle the field code view. Type (or copy from here) the following:
IF PAGE < 5 "" PAGE
ukoliko ovo ne upali moze i pesacki ovako>
1. On the page you wish you start the numbering (let's say it's page 4 for this example), insert a "Next Page" section break.
2. From the View menu choose Header and Footer.
3. Click in the footer of page 4.
4. On the Header and Footer toolbar, click the "Link to Previous" button to break the link between page 4's footer and the footers on page 1-3. You'll notice that the note at the top of the footer that said "Same as Previous" has disappeared.
5. Click in the footer of page 4 to make sure your cursor is inside it.
6. From the Insert menu, choose Page Numbers.
7. Click the format button and select the radio button for Start At and enter 1 in the box. Click OK.
8. Counterintuitively, you'll need to leave the box for show number on first page checked, since technically you're starting the numbering on the first page of the new section, so click OK at this screen.
9. Your page numbering should now start at 1 on page 4 and will not appear on any previous pages, but will continue to appear on any subsequent pages
