"Publishing to NuGet feed" instructions are not helpful

[qwertie]

This page refers to a settings page "Settings → Encrypt YAML" that does not appear to exist. There is a "Settings → NuGet" section that contains an "API key" that I can "Generate" but there is no explanation of what its purpose is.

I already have a section like the following in my appveyor.yml and I am wondering: how do I safely update this to use a new key that I generated on nuget.org (given that the file is publicly visible on github.com)?

deploy:
    - provider: NuGet
      server:
      api_key:
          secure: DHTp3wMjKqyca2PWftol2wq7DxE9KdL8AizHVIS24T4DSSMXgc0bIiCGvvA8SkTH
      skip_symbols: false         # Whether to not publish symbol pkgs (src/pdb)
      artifact: /.*\.nupkg/
      on:
          branch: master          # Release from master branch only.
          appveyor_repo_tag: true # Deploy on tag push only.

[FeodorFitsner]

"Encrypt YAML" is under "Account" menu now. Docs have been updated, thanks for the catch!