its quite simple .just uninstall your current graphic card drivers and then switch off your pc and remove the power plug and then :-
1.(if you already have a graphic card then read this step )slightly remove your your graphics card from pci-e slot .
2.(if you doesn't have a graphic card then use this step )if you doesn't know how the pci-e slot looks like then you should look at the slot which looks like blue /black in color (colour depends on motherboard).
3.now insert the graphics card (by holding its corners ) gently in the pci-e *16 slot (don't worry about its versions like 2.0 or 3.0)
3.you'll feel like card has taken its place .after this ,screw your card with the cabinet .
3.then connect your monitor according your graphic card socket .
4.simply start your pc then your pc will notify you that its switching to its basic drivers .(don't take tension ,your graphic card is at the right place)
now install drivers from cd simply and reboot your pc. set resolution according to your screen and restart again .
your graphic card is installed .