I tried pressing the info button and It took me to that wifis page, but It didn't show anything about the wi-fi password.

This functionality is only available on iPadOS 16, which is not compatible with your iPad mini 4.

If your other device is a iPhone, iPad or iPod touch, try using the password sharing functionality instead : How to share your Wi-Fi password from your iPhone, iPad, or iPod touch - Apple Support.

Assuming that your iPad is running iPadOS16 or later, you can easily find your WiFi Passwords from iPad settings:

Settings > WiFi

At top-right of the WiFi settings page, tap the Edit button to expose a list of all the WiFi networks that your devices have stored in your Keychain. Tap the associated blue “i” icon to see the WiFi connection properties; tap the Password field to reveal the WiFi network Password.

Additional information can be found here:

Find your saved Wi-Fi passwords on iPhone or iPad - Apple Support

For iOS/iPadOS15 or earlier, you cannot see stored WiFi Passwords - unless you have manually stored them elsewhere.