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Errr, forgive my silliness...
But how can I add a token in the template, to indicate that body text should "insert-here", not the end of the template?

just like this↓
<body>
<!-- message body section -->
!insert-here
<!-- signature section -->
signature
</body>

Or is there any manual I should referred to?
Thanks

Questa recensione riguarda una versione precedente (0.8.4) del componente aggiuntivo. 

Just put any HTML with the attribute stationery="signature-placeholder" or stationery="content-placeholder". I usually use SPAN. Note that whole tag will be replaced by signature/quoted content.