Dell Inspiron 15R 5537 Graphics Card Upgrade?

Hello, I have had to open up my Dell Inspiron 15R 5537 laptop due to a problem with my hard disk drive, and thought, ‘while it’s opened, why don’t I upgrade the graphics card as well?’

I have done some searches on Google and YouTube, which was where I saw a video to replace my hard disk drive, and couldn’t find any videos on my specific model number, and when I searched for Dell Community specific pages, I read that the graphics card was not replaceable, or that it was VERY difficult because it is attached to the motherboard 

I just wanted to confirm if what I found was correct, or if there indeed is a way to replace my graphics card on my Dell Inspiron 15R 5537