Lenovo H50 Graphics Card?

I have a Lenovo H50 desktop I would like to get a better graphics card to where I can actually play more games. It says it has a AMD Integrated Graphics (R7). Would I be able to get a better one and if so how do I know what to get and the basics I've never done this before.

Sadly you can't put a graphics card on a laptop. Even via thunderbolt 3 with an enclosure is just a waste of money.