Using the Hand tool, right-click/Control-click
the bookmark or page thumbnail, and choose Properties.
Using the Select Object tool, double-click the link,
media clip, or form field, and choose Properties.
Click the Actions tab.
From the Select Action menu, select the action type to
occur, and then click Add. You can add multiple actions; actions
execute in the order that they appear in the Actions list box.
(Optional) Select an action on the Actions tab, and use
the buttons to reorder, edit, or delete the action.