You can install an SSH key by executing
Now you can log in to the remote server with your password and ssh-copy-id will do the rest.
Append your public ssh key to the
authorized_key file on the server.
As a one-liner:
cat ~/.ssh/id_rsa.pub | ssh firstname.lastname@example.org 'cat>> ~/.ssh/authorized_keys'
Both commands pretty much do the same. The first way is way easier though.
The next time you can connect to the server using your SSH key.