Retrieve User Name From Subscriber

I have problem like this.

I have 2 server with merge replication
the first as distributor and the second as subscriber.

I'll try to make trigger from database replication on distributor.
the problem is if any change data on subscriber, i need the user name from subscriber.

right now, i used user_sname to get user name.
but on distributor always get name Administrator.
it's because when subscriber update or delete data, distributor always change/delete/add data from subscriber as Administrator.

but, we know data change from subscriber it's from user. I need to retrieve user name that who change the data.

someone have any solution.

This is my triggers

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER TRIGGER [tr_insert_jour] ON [dbo].[Jour]
AFTER INSERT
AS
BEGIN
SET NOCOUNT ON;
declare @date1 datetime, @person varchar(30) , @journal_code char(4), @journal_no char(8)
set @date1 = getdate()
set @person = user_name() ----this is user name
select @journal_code = JRN_CODE from inserted
select @journal_no = JRN_NO from inserted
insert into log_insert_Jour values (@date1,@person,@Journal_code,@journal_no)
END


Thanks

Thanks