Adding a public key to your Linode account is easy.
From your Linode account home page, click the “My Account” link in the top left corner.
On the My Account page, click the “Keys” link in the top right corner.
On the Keys page, click the “Add a Key” link in the top right corner.
Enter your public key into the “Key Name” field.
Click the “Add” button.
Your public key is now added to your Linode account.