Heya,
It's a missing feature :).
We are going to add a checkbox that, if set by a mentor, allows the
student to edit their proposal. For now you should post any updates as
a comment on your application, or post a new version of your
application
somewhere else (like Google Docs) and link to it in a comment.
We're trying to add this checkbox as soon as possible, but don't rely
on
it, in other words, use the workarounds mentioned above until the
checkbox
is available.
--
Cheers,
Sverre Rabbelier
Melange Developer