How to Install XI Patch?

Hi,

I had installed XI 3.0 and did not install any further path for XI.

Could any one please let me know where i can find information on "How to install XI patch". This much i know that this is available on SAP site but have not been able to find or recall my memory where exctly these documentation reside.

It will be great help if anybody can helpout.

Thanks!

Dheeraj Thareja