How do I install life is strange?

I got today life is strange as DvD for the PC, but unfortunately have no idea how I instalieren the whole ect.
I've also created a Square Enix account with the code in the box. If that's important
P.S have an HP laptop (unfortunately I do not know the exact name) with CD or DVD compartment, but I do not know how I open it, because a simple click does not open it unfortunately.

I think you can enter the key on Steam.

Install Steam, create an account, then you can enter there the key that is on the packaging.