You can set probability of closure directly in "Administration".
Set a Probability of Closure
- Click on the “User” and select “Administration” from drop down menu.
- Click "Sales Space".
- Select Pipeline from the list of "Sales Pipelines" and click on Edit button.
- Click on the "Edit" (a pencil icon) for a corresponding sales step.
- Configure your sales step according to your preferences and click on the "Save" button.