I'm not familiar with IMAP, nor with the mentioned module, but have you searched CPAN? For instance, IMAPClient returns the quire detailed documentation for IMAPClient.
Somewhere around Quote, the following snippet is shown:

$imap->store($imap->Quota('+FLAGS'),"(\Deleted)");
[download]

For more examples, you should read the documentation a bit further...

Good luck!

-- JaWi

"A chicken is an egg's way of producing more eggs."