You need to get a motherboard with at least 1- PCIe x16 slot (2.0 or 3.0). It needs to be the correct form factor to fit in your case (mATX or ATX). It needs to have the socket that matches your CPU's socket, and support your RAM speed.
You will also need to get a Power Supply that supports your Graphics card and has enough amperage to supply your PC without exploding.
If it's a mainstream pre-built system like an HP or a Dell, it's not unusual that they have onboard graphics without a PCIe slot. It's one way the keep the costs down.
You need to get a motherboard with at least 1- PCIe x16 slot (2.0 or 3.0). It needs to be the correct form factor to fit in your case (mATX or ATX). It needs to have the socket that matches your CPU's socket, and support your RAM speed.
You will also need to get a Power Supply that supports your Graphics card and has enough amperage to supply your PC without exploding.
If you want to know what CPU Socket, what Motherboard form factor, what RAM speed, and what Power Supply you should get, you should ask a full question, or a list of questions, which includes what PC you have, and what Graphics card you are trying to use, instead of whatever that was that you posted.