I'd find a copy of the paper form and see if they still have the fax option. Will at least save you snail mail time.
If there is an error on your controlled hunt
application (incorrect party leader’s license
number, hunt choice, etc.), or if you need
to change your application, you must
contact the Controlled Hunt staff by
June 1 to have it corrected. Mail a
photocopy of your application with the
corrections marked to ODFW-Controlled
Hunts, 4034 Fairview Industrial Dr SE
Salem, OR 97302, or fax to 503-947-6113
or 6117.
I've always just Faxed in changes no problem. Has worked fine in the past.