Maria:
There is a new command:
Label Selected Elements for this (since elements can now have multiple Labels, the old check box is gone). If you have migrated an old Work Environment, this command will need to be added to the WE.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David