How to unhide my network

See -> Recommended settings for Wi-Fi routers and access points

Recommended settings for Wi-Fi routers and access points - Apple Support

If you mean that your WiFi SSID is not publicly visible ...

... that is a setting in your WiFi access point (often integrated w/ your router)

Different manufacturers call it different things ... but "Broadcast SSID" is pretty common.

Your WiFi WAP / Router manual will have the exact details of how to configure it's settings.

Do you have an Apple AirPort Wi-Fi router providing your wireless network?

or

If you don't, what is the make and model number of your wireless router?