Here is a written guide to help with th install if you want
To install a graphics card you first want to remove the two highest
expansion slot covers (the grated things on the back of the case right below where everything plugs into your motherboard from the outside.) Then take your graphics card and find the large section on the side where it has a bunch of gold teeth sticking out with a notch in one side
like this . line up the cards ports with the opening you just made in the rear of the case and plug these teeth into the large black slot below your cpu fan and push down until locks into place(it will only fit in one way so you don't need to worry about that.) once that is seated properly you have to get the screws that came with your case and/or graphics card. and screw them into
the holes above the I-O of the card. now that the card is properly secured you can plug your monitor into it and try to boot up your pc. If this works then you are going to want to go to the Nvidia website and download
GeForce experience. once it is downloaded, run it and it should take you through a set up wizard that will configure your drivers for you and then you should be good to go (You can close geforce experience once it has finished setting up the drivers.)
That was kinda long so feel free to ask questions