Thank you so much for your reply.
On client, I went to File-->Replication-->Settings, but on all the tabs, everything is in grey, I cannot change anything.
From the Domino Administrator, on the "Basics" tab everything is grey too, so I cannot uncheck "Send documents to server". On the other tabs, I can change.
I assigned the "Manager" access for that user.
So what can I do now Bob?
Thanks a lot.
Tien Vu Tan.