How edit something like this to create element in Lovelace?

Sorry forthe silly question but I’m new and I’m trying to learn!
I’ve a ezviz camera and I’ve found this link about the integration in HA:

Ok… I’ve been done the easy part and copied the part:

  - platform: ezviz
    username: YOUR_USERNAME
    password: YOUR_PASSWORD
        username: YOUR_CAMERA_USERNAME
        password: YOUR_CAMERA_PASSWORD

(setting the appropriate parameters)

But I don’t know the steps to create a Lovelace card using the code that is post down?!?
where I I enter it?
How can I use to make a card??