You can enable WIFI as one of the system settings, or by clicking on the WIFI icon in the system tray at the bottom of your monitor screen. The icons there are rather small, but you can hover the mouse pointer over them to find out which one is the network manager icon.
When activated, it will display a list of WIFI networks that are available, and you can select yours, then provide the password for it. You should be connected to it almost immediately, and a notification will pop up to let you know you've succeeded, and are now connected to it.
