First, create a Elementor AdBlocker Detector widget on Common Ninja.
On the widgets catalog, find the AdBlocker Detector and enter the Editor.
When you're done creating the AdBlocker Detector widget, click on the Save Changes button at the right top corner of the editor.
If you don't have an account on Common Ninja, you'll have to register first.
When you're ready to add the AdBlocker Detector widget to your Elementor website, click the Add To Website button at the top bar of the Editor.
On the window that opens, click the Copy Icon to copy the widget embed code. In the next steps, you will paste this code into your Elementor website.
Now, let's head to the Elementor's editor.
On the Left panel, enter Widgets and scroll to the HTML widget.
You can also filter the widget list by searching for the HTML widget.
Drag and place the HTML widget wherever you wish the AdBlocker Detector to show.
Now, in the HTML Code window on the left panel, simply paste the AdBlocker Detector embed code you've copied before.