How can I add more memory?

How can I add more memory?

Asus Support site says to not open the cover, work should only be done by "licensed" technicians. Heck I'm A+ certified (I do networking though), even that yielded no info. Anyway is there a way to see ahead of time /pre-cover popping, what I can add as far as memory? I just want to make sure I buy the correct kind.