Problem with DCN

Hi, I get this error when executing a DCN:

Problem accessing /dcn/DCNServlet.

Reason: Authenticate user failed for user DCN in domain dbappz. Check username and/or password. The reason is Login Failed: user 'DCN@dbappz'

I know this happens because I don't have the DCN@dbappz user mapped with the logical role SUP DCN User in the SCC.

My problem is that I don't know how to make this mapping in the SCC.

In my security profile, in the Authentication section I have a PreConfiguredUserLoginModule with the DCN user but I don't know where to map this user with the DCN logical role.

In Role Mapping I don't see anything, only one other logical role.

Any ideas ?

Thanks!