The database is in the ONLINE operational state.
You are logged on to the database as a database system administrator or database user with user class DBA and are owner of the database user whose properties you want to change.
The database user whose properties you want to change is not currently logged on to the database.
This function has not been implemented in Database Studio yet. Use the corresponding SQL statement instead.
More information:
SQL Reference Manual, SQL Statements Overview
Database Administration, Database Users