Show or hide tags
On the View menu, click Show GNML, or press ALT+F9. Note: the tags are displayed only in the source pane, in the color you've selected in your preferences (Edit > Preferences > Source > Colors > Markup).
Insert tag
On the source pane, press F9. The > and < are automatically inserted and the I-beam is between them. Enter the tag name and its parameters (if required). For the list of available built-in tags, see Built-in tags (by purpose).
Delete tag
On the source pane, show tags, and then click after the tag you want to delete, and then press BACKSPACE. The entire tag is deleted.
Edit tag
On the source pane, show tags, and then click in the tag you want to edit, and then edit what you want.
To learn more, see also