Open Compute -> Key Pairs

Click Create Key Pair and insert the name of the key (eg. "ssh-key")

After generating Key Pair your new Private Key will appear. Click Copy Private Key to Clipboard.

Open a Text Editor (e.g. Gedit) and paste there your key.

Save the key as "id_rsa"  in the folder of your choice (in linux the keys are usually kept in ~./ssh folder).

In case of linux you should change the permissions on the private key:

Click key name in Key Pairs menu and read your public key. You can also save the key to a file like the private key. For example named "id_rsa.pub".

• To connect via SSH to your Virtual Machine using Linux, follow the steps in this FAQ: How to connect to your virtual machine via ssh in Linux?
• To connect via SSH to your Virtual Machine using Windows (Putty), follow the steps in this FAQ: How to access VM from Windows (putty)?