PLEASE HELP is it possible to change the video memory on my alienware 14 to meet a games recommended requirements? or how would one go about meeting the games requirements?

I have an alienware 14 and have received the new gears of war 4 as a gift, it says that I have to have   

2GB minimum video memory and recommends 4GB video memory and that I do not meet either of these requirements. how can I solve this problem. any help will be appreciated and as you can tell by my terminology I'm not very computer literate.