Select the Show Annotation action in the Team context menu to open the Annotate Editor for a ClearCase element:
If you use the Annotate Add-On for the first time you will probably be asked whether Quick Diff should be enabled:
Answer the question with OK, otherwise the Annotate Add-On will not work.
As a result the Annotate Editor opens for the selected ClearCase element. The window shows the contents of the document. For more information about the features please refer to the Reference for the Annotate Editor.