To add a bookmark from a pattern window click on the button with the picture of a bookmark.  To add a bookmark from the staff editor, click on the second button above the vertical scroll bar.  You can also choose ‘Place Bookmark’ from the Edit menu.  A dialog will appear asking for the text message you want the bookmark to hold as well as where in the music you want the bookmark's flag to appear.

Notes:
• You must have at least one letter in the bookmark text field to place the bookmark!  If you don't want any text, but just want the bookmark to mark a place in a song, then type a space for the text message.

• Be sure not to include any characters except letters or numbers in the ‘Bookmark Text’ field of the ‘Place Bookmark’ dialog.  All other characters will not be displayed in the bookmark’s popup menu.