Hay mixer
After reading your posting here we are missing some useful information.
We don’t know which OS do you use, we don’t know if preinstalled OS is original that you got with your notebook or not.
If your notebook was delivered with preinstalled OS than all hardware components must be installed properly, including WLAN card. You should be able to enable/disable WLAN card using FN+F8 key combination.
Tried that press FN and F8 or whatever and it didn't work.
How to understand this? Can you see flash cards? Is WLAN option available or not? What do you see on the screen when you press FN+F8?
When the WLAN card is enabled properly all you must do is to scan area and connect to available WLAN.
You know it is not easy to discuss about this. There are so many important things. Where to start?
I don’t know if you have good experience with PCs but maybe you should ask someone for help.