How do I set up a second iCloud account?

You can restore the phone to factory settings and there should be an option to create an Apple Account at setup:

Create your Apple Account when you set up your device

1. Tap “Forgot password or don’t have an Apple Account?”
2. Tap Create a Free Apple Account.
3. 
   
4. 
5. Select your birthday and enter your name. Tap Continue.
6. Provide your email address. This primary email address will be what you use to sign in to your Apple Account. If you don’t have an email address, tap “Don’t have an email address?” to get a free iCloud email address.
7. Follow the onscreen steps to verify your email address, create a strong password, set your country or region, and set up two-factor authentication. If you choose to skip this step, you’ll be prompted to do this later in Settings.

They can also create an Apple Account from the App Store, see How to create a new Apple Account - Apple Support. Make sure that you’re signed out of iCloud.

onalayah wrote:

Thank you, I will try this BUT the SIM I’ve been using with that phone isn't registering as active. I will resolve that

and then follow your suggestion. 😊

So far, even though I have reset the phone to factory settings it is not allowing me to set-up an new iCloud account.

Create the Apple Account elsewhere (see link below), and then log into the Apple Account from the iPhone, when you have reset and are then first setting up the iPhone.

How to create a new Apple Account - Apple Support