Laptop memory upgrade possible with buying online

It was such a joy to have received a laptop from my sister working in Europe and she even installed all the games and applications I wanted which was just so great! I guess the only change needed in here must be a RAM memory since it was only 1 GB and most of the games I want to put in there would hang up on this size, I guess 2 GB would be the reasonable memory module to put in here and so off I searched where I could find a Apple memory that is fit for my needs at the present time. I know laptop memory is readily bought online so this is exactly what I did and by my lucky stars I found a good site in memoryupgrade.pro which carried out all the modules I can think of which would be useful for me.