Hi - it may be in your spam or trash folder, but if not, you can also reset by following the instructions on this site: https://www.digitalocean.com/help/account/
I understood problem it's was ssh key for autorization but why service ask me about login and password if I use ssh key...
@onesLightning - If you've setup your Droplet with an SSH Key and use the terminal from within the DigitalOcean control panel, it will still ask for a password. This is standard as their CP has no way of knowing where your SSH Key is located, nor does it have access to your local machine, so it's not able to use what would otherwise be valid.
To use your SSH Key, you'll need to use PuTTy (easiest for Windows users) or simply the Terminal on OS X. From the Terminal on OS X, running:
ssh root@DROPLET_IP -i /path/to/key
... will allow you to login.
If you're on Windows and using PuTTy, you'll most likely need to convert your key to one that can be used by PuTTy as it will not use the standard keys that are generated using the ssh-keygen utility.