Go to https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

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Download the last release of putty : 

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Start install of putty :

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In the start menu you have multiple new applications under PuTTY folder :

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First step is tho genereate the SSH key. For this run the PuTTYgen 

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Click on Generate button

You need to move the mouse over the window

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When completed you will get a new key

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Before saving the key uptate the fields 

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In key comment put you email address

And enter a passphrase

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Save the public key on you computer

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Save your private key
 
Keep this file  in a safe location ! And be sure to have a backup ! 
There is no way to recover the private key !

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Now you ca provide the public key : 
 
Just do a copy paste of this field

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