Hi Joanne,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
Wired headphones usually do not require specific setup, the computer should detect them once connected. So, please ensure the wired headphone works properly by testing it with another device. Then, test the computer's audio jack by testing it with another wired headphone
If both work well, go to Settings > System > Sound > Select your headphone as an output device. Or, go to Control Panel > Sound > Playback tab > Right click on the headphone and set it as a default device.
Please let me know if you need further assistance.