How to secure network
How do I secure my wife network
iPhone XS Max, iOS 14
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You have to change the settings in your router or wifi access point.
This will depend on your router/access point.
Normally you will log onto a web page of your router (you might need to know the password for this - often supplied on a card with the router, or printed on a label - or even a factory default password) and change the settings in there.
For full details specific to your router, you will need to go to the manufacturers website, and look at FAQ, help or documentation, or ask on the manufacturers forum.
You need to change the setting on your router so it is at WPA2 AES or better.