Pressillion has a SSH Keys feature which allows you to add SSH Keys to your Profile Settings so that they will be added automatically to any servers you provision.
Please note, this feature does not work retroactively, that is to say any SSH keys which you add will only be automatically added to newly provisioned servers.
To add an SSH Key, go to User Settings > SSH keys (see below)
This will take you to the SSH Keys page where you can add and mange your SSH Keys.
When you have added a ne SSH Key you will see a notification lie the one below to confirm success.