Where is the API key?
You can find the site key information you need in the System Administrator Guide: https://docs.civicrm.org/sysadmin/en/latest/setup/site-key/

The API key is in the database and needs to be set up for a contact that has access. You can install the API Key extension which will enable the API Key in the contact summary if you have admin rights: https://civicrm.org/extensions/api-key

The URL of the CiviCRM instance will be in your civicrm.settings.php. You can check it in the UI if you navigate to Administer>System Settings>Directories and click on the question mark in the green bit on the top of the screen. You will see a window in the right hand corner of the screen and the civicrm.root will be the URL for your CiviCRM instance.

Hope this helps!