Re graphics card

No because this is a laptop.

When you want to play games with a laptop you must purchase it with a good GPU from the start.

What is the full model number, as the higher end 15E models also come with nVidia cards to do the heavy GPU work.

Before buying a laptop (especially if it's not cheap) you should have done your homework better and analyze your needs more carefully. If you just told the salesman you were going to play a heavy game like Black Flag he would have proposed another laptop with a better GPU. Integrated Intel GPU is not meant for gaming. It's like going to a car dealer and buying a Toyota Yaris without mentioning you need to tow a boat and after that you complain that the engine is not powerful enough to tow the boat. The blame is only on yourself. Maybe it's not too late and you can still return the laptop for an exchange.

You only have 2GB of RAM in this thing? I thought it was a new laptop? Nowadays I thought the bare minimum for RAM was 4GB? I've seen very cheap entry level laptops sold at 400$ and they come with 4GB, and this is the bare minimum for me. I recommend people to get at least 8GB. So yes, adding more RAM will help general performance, but don't expect miracles to happen to your graphics card.

Real video card have dedicated RAM. Sharing system RAM between CPU and GPU is not good. This is one of the reason why integrated card offer poor performance in gaming. The other reason is the weakness of the graphics processor (GPU) itself, even if you add more memory, the graphics chip remain the same. And even if you overclock it and add tons of RAM, it will still remain weak no matter what you do. You simply can't expect miracles with a Intel HD4000.

You should really have told the vendor that you were going to play a heavy 3D game like Black Flag. I'm sure he would have suggested a laptop with a better card (AMD or nvidia). Integrated cards by Intel are only good to play 2D games like Plants vs. Zombies and stuff like that.

Also be careful what you choose, not simply because you have a AMD or nvidia card means you will automatically be able to play any games smoothly at any resolution and settings. AMD and nvidia also have entry level cards that don't offer that much performance, especially in laptops.

In general, I don't find laptops to be a good gaming solution especially when you want to play very demanding games (like Battlefield 4, etc...). You need to spend over 1000$ to get something that is barely decent. As I said before, for gaming, a 600$ desktop will easily beat a laptop that costs twice its price.

Before buying a game, it's also a good idea to look at the requirements. Because your laptop doesn't even meet the minimum for Black Flag... So you should have known before buying the laptop or the game that it wouldn't work. The requirements for this game are quite high, and personally for a flawless gaming experience I think it's better to aim for the recommended requirements, not just the minimum. See for yourself:

http://www.game-debate.com/games/index.php?g_id=6805&game=Assassins%20Creed%204%20Black%20Flag

So a laptop that would meet the recommended requirements for this game will probably cost around 1500$ at least.