How do I change my Wi-Fi password

See the following Apple articles:

Recommended settings for Wi-Fi routers and access points

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

If you need help with your Wi‑Fi password

If you need help with your Wi‑Fi password - Apple Support

danette14 Said:

"How do I change my Wi-Fi password"

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Changing the Wi-Fi Password:

Go through your router. You'd have to use the default gateway to log into it.

Enter one of these IP Addresses into the address bar of your Web browser:

192.168.0.1
192.168.1.1

Next log in as the administrator, proceeding from there.

That is a question for your internet service provider. Contact them for help.