After successfully completing a DB2® installation, you now have to add users to the DB2ADMNS or the DB2USERS groups for users that need to run local DB2 applications and tools on the machine.
To add users to the appropriate group:
If you did the install and chose not to enable the new security feature you can still do so post-install by running the db2extsec.exe command. Adding a user to a group takes effect the first time the user logs on after the user has been added. For example, if you add you user ID to the DB2ADMNS group, you need to log out and then log in again for this change to take effect.