Dell AMD Graphics Help

Hello, I'm trying to play a couple games on my laptop, like City Skylines, and when I go to play them, I get a lot of lag, so I started to look around knowing I had a dedicated graphics card as well as integrated, a R7 M445 dedicated card and R7 integrated, but it seems to only be using the integrated, which has a lower clock speed, 933mhz vs 1000mhz, worse RAM speed, DDR3 vs GDDR5, and worse RAM, 512mb vs 4gb. So when I try to get the dedicated graphics card to be used instead of the integrated, it never works. My system specs are an AMD FX 9800p processor with 2.7ghz speed with a turbo up to 3.6ghz, 16gb 2400 single channel DDR4 RAM, and the AMD R8 m445DX graphics cards. This is the computer link http://ift.tt/2kfBptn
I've tried turning the performance to max and all, but some help would be much appreciated. Thank You

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