National Science Foundation proposals can be submitted through FastLane or Grants.gov Workspace. Keep in mind that a hard copy of any proposal needs to be routed through the proper channels for signature before the electronic proposal can be sent to the agency.
What is NSF FastLane?
FastLane is the National Science Foundation online website through which they conduct their relationship to researchers, potential researchers, reviewers, research administrators and their organizations.
Listed below are reference materials which may help you understand the NSF FastLane website: