I want to add additional memory of either 1 or 2 gigs. Only have 512. How do I install it?

Hi,
You can find the memory type and specifications for your laptop here:

http://www.crucial.com/store/listparts.aspx?model=Business%20Notebook%20nc6220

When you get the memory, it'll come in 1 or 2 little sticks with gold contacts. You'll need to turn off your laptop completely, flip it over and lay it flat on a table. You'll need a small phillips head screwdriver to open the access panel. Your laptop has one or more access panels on the bottom. One of them will have memory modules in it. You'll know when you find it because the sticks are laying flat near the surface. TO remove them, there are two small clips on the sides of the module that hold it in place. If you unclip the module by pressing outward on these clips, the module will "pop up" so you can remove it. Install the new RAM modules by reversing this process and booting the laptop up. Hope this helps!