To insert a structured annotation (label) at the current video position, left-click the label, or in case the label has a scale, left-click one of the scale values displayed when the mouse cursor is over the label.
In contrast to free text annotations, structured annotations work with a pre-defined vocabulary, i.e. the user can only insert annotations chosen from a list of pre-defined annotations.
We call the word of this vocabulary Labels. Labels are grouped into categories and optionally support a scale.
The categories themselves are grouped into All, Public and Mine. Public categories can be seen und used by all users for all video clips within a channel, whereas Mine categories are only visible to the user who created them. All lists both the public and private categories.