To edit or remove a bookmark, click and hold on the bookmark’s red flag in either editor.  A popup menu will appear displaying the bookmark’s text.  Select this menu like you would a normal menu on the menu bar (ie:  position the mouse over the menu and release the mouse button).  The ‘Place Bookmark’ dialog box will be displayed holding the information of the selected bookmark.  Here you can edit the text or position.  To delete a bookmark simply delete all text in the ‘Bookmark Text’ field and choose ‘OK’.