Here let us open the list, where you want to show the alert box. In the ribbon click on Nintex Forms button like below, which will open the Nintex Forms for Office 365 designer.
Also, you can read a few useful articles:
– Auto-populate current username in people picker in SharePoint Online Office 365 Nintex forms
Then in the Nintex forms designer, click on Form Settings button like below:
Now Save it and then Publish the form. Click on the Publish button to publish the form.
Now when you will open the list and try to add one item, it will show the dialog box on the form load.
Hope this will be helpful to start, we will see some more examples in the upcoming articles.
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