You will need PuTTY to generate an SSH key easily and quickly. You can download PuTTY here.

After installing, open up PuTTYgen, you can find this application when opening start menu and search for "PuTTYgen".

Make sure the type of key is set on "RSA" and press "Generate", you will be asked to move your mouse a few times over the grey area (this way it renders a unique pair).

After this has been done, you will have a keypair generated. You can save this by pressing "Save private key", save this to a secure file location.

If you need the public key again you can return to PuTTYgen and load the private key back in.

You will then need to copy the public key string displayed in the PuTTYgen window into Ploi to add your new SSH key to your Ploi servers. You need to make sure you use this string because if you use the "Save public key" option it will save it in a different format and will not work with Ploi.