The printer monitor applet is added to the list of available panel applets by the TurboPrint installation program. To make it visible in the panel, you must add it manually. Click on the panel with the right mouse button and choose the pop up entry "Add Applet to Panel...". A list of available applets will be shown – choose "TurboPrint Printer Monitor Applet" from the list. After clicking on "Add to panel" the TurboPrint applet should be visible in the panel.