>It seems to me that it doesn't know what "EXISTS" since the subquery is selecting everything.
>
>Since you only want the Firstname matches, maybe try this?
>
>SELECT Member.FirstName FROM Member ;
>> WHERE EXISTS ( SELECT Firstname FROM New ;
>> WHERE Member.Numero = New.NoMember2 ;
>> OR Member.Numero = New.NoMember3 ;
>> OR Member.Numero = New.NoMember4)

There are several fields that need to be selected. I only included Member.FirstName to simplified the example.