Set default check mark in Individual customer form

Hi,

I want to set "Marked" check box of prospect when i open the Individual customer form.

I came to know that, i can do this by define work flow rules.

I did it but somehow it wont work. (When i open the form, prospect has not checked mark.

My Step: (Let me correct if wrong)

Step 1: Enter basic data

Description: Se default value of Individual customer

Business Object: Individual Customer

Timing: On create only

Step 2: Define Condition

What should i define?

Step 3: Define actions

There are four actions

What should I select in that too?

Thanks