I have SQL Server Express on Windows 10 Pro:
It works fine.I created databases using the default user (Windows user). I need to specify a user ID and password for other purposes.
I did this
but when I try to login using this user id and password, I get this error
I thought it is very easy to add new user. It seems harder than I thought
I also tried to use SA user ID,
I enabled it
and changed the password
Yet I still get this error







