I have generate the ssh with putty and upload it to my account, but I cannot connect my droplets still.I set as the same as the guide(https://cloudsupport.digitalocean.com/s/#none|ka21N000000Cp7TQAS), but it will apear error message like:
Disconnected: No supported authentication methods available(sever sent:publickey)

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Hey friend,

It sounds like password login is disabled, and this droplet uses SSH keys. It also sounds like PuTTY may not be using your private key, thus resulting in a situation in which the server offers no connection method that PuTTY can use to make the connection.

You can either use the web console to edit /etc/ssh/sshd_config and allow password login, or make sure to feed PuTTY the private key that is a matching pair with the public key added to your droplet.

To create a droplet that accepts password login by default, make sure not to select an SSH key on the droplet create page.