Obviously, the OP has submitted hir resecnation, and now wants to subtract
it. (translation: retract a resignation).
This is not a function of Word. It's a function of your email program
(assuming you submitted the resignation using an email). If you're using
Outlook 2007, open the email and in the Message ribbon tab, click Other
Actions - Recall This Message. Whether or not it works depends on your email
server. I believe this can work if you're using Microsoft Exchange and the
email has not yet been opened. I've never seen it work for regular email,
though.