Adalysis will automatically alert you whenever there are opportunities to add negative keywords from your search terms data. You will see the alert under Audit Alerts / Search Terms on your Dashboard.  Take action without leaving the Dashboard by selecting the 1st option (the search terms will then be added as negative keywords) or click on the View search terms button to analyze the data first. 

Step 1

Clicking on the View search terms button will open the below screen:

Step 2

You can customize the conditions used to detect potential negative keywords:

Step 3

Now you will be able to add negative keywords: