Using a selection tool, select a text
frame, a graphics frame, or an element in the Structure pane, and
then click a different tag in the Tags panel.
To retag a story, use the Type tool to place a insertion
point anywhere in the story’s text. Select Retag in the Tags panel,
and then click a different tag.
To retag a text block, use the Type tool to select the
entire block of text. Select Retag in the Tags panel, and then click
a different tag. (If you select Add Tag and then click a different
tag, a new child element appears in the Structure pane.)