When users subscribe to a label, they are notified by email when a new post is created with the label. One thing to note about labels is that they are applied at the forum, knowledge base or blog level. Thus, predefined labels and subscriptions to labels exist only at the level at which they are applied.
For example, if you subscribe to a label named 'How To' on InstallShield forum, it will not automatically subscribe you to an identically named label at FlexNet Operations forum. You will have to subscribe twice, once at each board.
To subscribe to a label:
Navigate to the discussion forum, blog or knowledge base
Select a label e.g. How To
Subscribe to the label by either selecting the vertical line menu and choosing "Subscribe" or by clicking "Subscribe" in the on page copy.