Welcome to the forums, newcomer!
The GPU should drop into your motherboard's PCIe slot but the issue here is;
1| What is the make and model of your PSU and it's age?
2| If you plan to buy that GPU for gaming, don't bother wasting resources on it.
3| If you're buying the GPU for productivity reasons, please list the apps you intend to tax the system with, without mentioning an etc.