How to connect to router wirelessly...

Check your Wifi switch if it is turned on or not. Normally, you will see an orange LED blinking or steady if it is turned on. Check if the WLAN card is disabled at the Device Manager. Right click it and choose ENABLE. If it is enabled, right click WLAN icon at the system tray (can be found near the digital clock) and click on Properties. Click on TCP/IP properties and check if the AUTO-OBTAIN IP ADDRESS and AUTO-OBTAIN DNS SERVER is checked.
If the problem still persists, ask physical assistance to any IT support person.