This one is something I was always annoyed about but didn't have the energy to fix until now. I had already made a ctrl-c account with a password, but set up an ssh key and didn't want to have to use the password every time.
It was pretty simple to resolve with just a couple shell commands. This guide assumes you are using a linux computer, and already have an SSH private/public keypair you want to use. If not, look here for a good overview.
I did this using scp with the file key.pub 'scp key.pub username@server.name:/home/username'
Copy SSH IDfor this, ssh to your tilde & use the command 'ssh-copy-id username@server.name'
and that's it. Hope this was helpful ^_^