Step 1: Login to your UptimeRobot account. You can login from here: Login

Step 2: Click the [ My Settings ] Tab found on the top of the screen


Step 3: Find the API Key option under the API settings and click the show/hide option

Step 4: If you don’t have an API Key yet, click the [ Create the main API key ]

Step 5: Copy your Main API key that is displayed.

Step 6: Paste the API key in the Uptime Monitor setting found on your InfiniteWP admin panel.

Note: The Uptime Monitor setting can be accessed by opening the InfiniteWP panel  Settings  Uptime Monitor