Right done that, what next?
In the file click "Start_Windows" and the client will come up, then copy and paste the public key. Use mine for the example then I can test to see if you did it correct.
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.12 (MingW32)
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0Tc/klcLPnJjUIgTu+xyI9HGS7fUg5rUeeaSTWh33hyAkMxu3Mg0LPWLfRkiOhVq
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r0NNb3wgEzzpj42Y64arNMNVJ51Dw2KIN+JxFfBVLaLqT48Dyh75mETFF0PbAADN
b69RmY4OhN7WfXeulgISJFpe3y/mq5jpgBVaXbZ9JireFrqHTgzXOt1AYDCu7tNa
42/YKnG90tijCn9nGQ3qiE3hoEHnSDpkc+gkMLL+5AAma9hakkwtyASrvHgwcHKG
s+keP+QOtSWsPeu3Ua1DAobPU7BAIrvjeIPVkX+3naz6DjDFOeKKyfNxTcUm+fZw
9FY0s0R6Tg5RcNHkvF5entcxslfJ3eKaJiracM1VGrPMyVTNZp3M71eIe3tj3vXn
b+xMjBfgUf0Q1vsal7UqUbFoFQNZTJpTURrGN6W+O69hza477psUtlj+SQARAQAB
tAdUYW5nR1BHiQI4BBMBAgAiBQJSk7SzAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIe
AQIXgAAKCRCX/zyrwC5YpCjfD/sH3bQMN8aLJOuoezRrvseoJzR6EpxAm7UhKPXx
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AEOU751sgOXdcs7eQp7huYAEG+/AOeUIDnFmTmMwBnVp4a/b8ptZkUlt4AwMzrJt
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0izd23Quok8lc73DyBQzgUigM9bI0A==
=VO3m
-----END PGP PUBLIC KEY BLOCK-----
Paste that into the editor and then go to "Import Key" and then select "Editor and it will import the public key.