This page allows you to define your impact level .Through this page you can :
Edit Impact Levels
Clicking on the 
icon next to an impact level allows you to edit it .
Delete Impact Level
An impact level can be deleted by clicking on the 
next to it .
Add Impact Level
You can add a new impact level by clicking on +Add New Impact Level icon at the bottom of the page.
Reorder Impacts
Impacts can be reorder simply by dragging and dropping the impacts .