If I am reading the specs for the correct system, then you should be able to purchase a graphics card for that system and slot it in.
Some models in that line up had discrete graphics as standard. Yours happens to be one which has it as an option.
[EDIT]
Upon further investigation, I have found that you are NOT able to upgrade the graphics on that system. There is no expansion slot for it which means that you are stuck with Intel HD graphics.
You also cannot just change the board as typically the motherboard layouts fit the chassis that they come in. My suggestion, if it has to be a laptop, purchase a gaming laptop or one which comes with discrete graphics. Even better, sink the cash you'd pay for a gaming laptop into a decent desktop rather.