You will need an HDMI adapter to connect your HDMI cable to a computer. An HDMI adapter is a small device that connects your HDMI cable to the video ports on your computer. If you have an older computer, it may not have an HDMI port, so you will need to install one.Once you have installed an adapter on your computer, plug your HDMI cable into the adapter and then plug the adapter into one of the video ports on your computer.