You put your install DVD in the drive and follow the instructions on screen
If your laptop does not have a DVD drive...
Download CS6 here if you have a serial number but no media
Thanks but subscribed a year ago May and don't know how to find my serial #
Have a file on Adobe activation keys for old programs but can't find CS6.
If you installed CS6 using a Cloud subscription, you simply login to your paid Cloud account and install
You would only need a serial number for CS6 if you are installing the standalone, non-Cloud version
https://www.adobe.com/account.html for your Adobe orders page... or