Liaquat,
If switch to the Master Page tab, the Palette gives you AutoText to insert page numbers. You can add those to the Report Header or Footer. I suggest you also cross post to development related forums like stackoverflow.com or Eclipse Birt forums for better suggestions from developer community as this is Birt development related query.
Hope this helps. Let us know if you have any questions.
–Swapna
MyEclipse Support