Changing password restriction in CreateUserWizard

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C#

I had research on the change password restriction in CreateUserWizard through the internet. And almost all of the answers given is for me to add the codes into the "Web.Config" file. However, this method won't works for my case.

Upon adding :
minRequiredNonAlphanumericCharacters="0" minRequiredPasswordLength="3"

there are blue curly lines below, stating that this attribute is not allowed. -- Is there anywhere i can add change the pw restriction apart on the web.config file or edit the web.config file???

This is my web.config file:

<?xml version="1.0"?>

<configuration>
<connectionStrings>
<add name="ASPNETDBConnectionString1" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated Security=True;User Instance=True"  providerName="System.Data.SqlClient"/>
</connectionStrings>

<system.web>
<authentication mode="Forms" />
<compilation debug="true" targetFramework="4.0"/>
</system.web>
</configuration>