Financial Strength Builder states in its Terms of Service that "TFG Inc and its agents and employees, hereby disclaim any responsibility for any consequences of the use by anyone of the information contained at this site." and "... are not meant to be a substitute for professional advice."
Do you really want to give your information to a website that doesn't even stand behind the information that it presents?
Your financial well-being is a very personal matter. Rather, than give your information to a fly by night website, do yourself a favor and go to a trusted website like Mint.com.