...
Go to Apps → Manage apps → Fields.
Click on Create custom field button on the right side of the screen.
Select WSJF) field and click Next.
Name and add a description to your field then click Next.
Choose between using your own inputs or map mapping existing custom fields select where the WSJF formula will be applied for value calculation.
Associate the field to the appropriate screens and click Create. You must associate a field to a screen before it will be displayed.
...