The second step for a Function is to define any Parameters that are required.

Enter the Name and Description for each Parameter, then select the required Data Type.

Click on the 'Next >' button to continue to the Function Wizard - Expression form.

Click on the 'Cancel' button at any time to leave the Function Wizard without saving any changes.

Click on the '< Back' button at any time to step back and review your work.

Once your Condition is defined, click on 'OK' to return to the Subject Condition or Calculated Column form where you will see your condition listed in the list view.