Match two email address in chronoforms

I'm setting up a registration form. There are two emails - Email 1 must match Email 2.
How do we validate these two email to ensure the 2nd email match the 1st email?

Hi boltuc,
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Please check the New Joomla User demo form - on the Design tab you can click the Confirm Email text field > Validation tab and set Matches to the name of the first Email text field.
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And in the Setup tab check that you have the Validation set to select All fields with validation rules.
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Bob

Hi Bob,
Yes this is a great feature of the new Chronoforms version but I'm using old Chronoforms 4 with joomla 2.5
Thank you
Artur

Thanks for your help.
Regards
Artur