How to see WiFi password on macOS Big Sur

On your Mac, launch Keychain Access (from the Utilities folder).

click on passwords from all the items on the left.

look through the list until you find something that resembles the password for your Router OR enter the network-name in the search bar.

Select that item and double-click on it or choose GetInfo.

In the dialog box that is presented, click the [_} Show Password box.

Enter your login password on the pane that opens.

The password for that item will be revealed to you.

here is a "magazine-article" version with illustrations:

https://www.businessinsider.com/how-to-see-wifi-password-on-mac

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Please read

Section: If you don’t know the Wi-Fi password

If your cable or internet provider set up your Wi‑Fi router:

• Look for a label on the side or bottom of the router. It might show the default network name and password. 
• Network Name (SSID): XXXXXXXXXX
• Network Key (Password): XXXXXXXX
• If your provider gave you a setup sheet, it might show your default network name and password.
• Contact your cable or internet provider for help recovering or resetting your Wi‑Fi password.

https://support.apple.com/en-us/HT204070

Launch Keychain Access.

Keychain Access > All Items Tab

> "System"in the sidebar

Select the wifi name, right click it and choose "Get Info'

Enter admin.name and password twice

Enable "Show password"

Password will be revealed.

If this is your router, reset the router to factory defaults, use the default password to log into the router then change the password and ssid.

Contact the apartment complex manager. and ask him/her. Ask a neighbor in the complex what the password is.

I have Spectrum as my ISP and a MacBook Pro.

Try changing the wifi network name and password.

Section: Change Your WiFi Network Name and Password

https://www.spectrum.net/support/internet/finding-wifi-name-password/

Unfortunately, I live in an apartment and it's not mine. I've checked to see if there was a label that had all the setting, but there's not. Very frustrating. When I called the internet (Spectrum) provider they told me that couldn't help me because its part of the complex.

As you are not the contract holder of the internet service, you will need to contact the organisation that has the contract for the internet service. for the apartment complex. They will either provide assistance or not depending on whether they have an agreement with you to let you access the internet.

I can't believe the apartment management won't tell you the complex wifi password. What do they tell new renters? Are you sure you are trying to connect to the correct router? Are you sure each apartment does not have their own router and contract with the Internet provider?