The SEES Fellows program has been discontinued. Proposals will not be accepted in 2014 and beyond. Potential candidates are invited to explore other NSF opportunities, including postdoctoral fellowships described here: http://www.nsf.gov/funding/education.jsp?fund_type=3.
For each of the programs listed on the above page, please follow instructions in that particular solicitation, and send your inquiries to the cognizant program officers.
Current SEES Fellows (who have been awarded in previous years) should review the information in the SEES Fellows Award Management Guidelines and communicate with their cognizant program officers for any issues related to their grants.