To configure something is to arrange it — especially a computer, a phone, a printer, or a program — so that it works with other equipment and with the settings you need. You choose the options, you connect the parts, you tell the machine how to behave. In tech talk this is an everyday verb: configure the router, configure your email, configure the display. Though actually, the older, wider sense is simply to shape or arrange the parts of a thing so they fit a purpose, not only computers. People still stretch it that way about a system, a room, or a plan, but the computer meaning is the one you will meet most. It is a little more formal than set up, which is the easy phrase for the same job.