After March 5, 2013, all counter offers must be submitted on the Online Offers system on the HomePath.com site.
This applies to both counter offers submitted by Fannie Mae listing agents and counters submitted on behalf of the buyer by buyer's agents.
Please refer to http://www.homepath.com/offerQuestion.html
for instructions on how to submit the counter through the Online Offers system. You can also call 1-866-218- 4446 for assistance.