Real estate for sale on TRULIA is represented by real estate brokers and their associated REALTORS.
Your profiles indicates YOU ARE NOT A REALTOR, therefore you can not claim a "listing."
'Claim It" allows the listing REALTOR to include that house in the inventory of properties which they can maintain, update and promote.
If your home is for sale, your REALTOR can do this.
If your home is not for sale, the "Claim It" does not apply.
Best of success.