mssql add new user

[ChirawatS]

Dear all,
Can I add 1 user on 2 mssql, and how to do that? I try to add new user but had error "user xxx already exists" it occured with second database with same user.


My windows server 2008 R2 with Plesk panel 9.5 mssql multi_user mode

Thank and hope you reply.