Editing files in terminal editors as VIM or Nano can be quite slow especially if you are not familiar working with them. A good substitute is SSHFS. SSHFS stands for SSH File System and gives you ability to edit files located on remote server (external beta in our case) from your local machine. The best part is that you can use any IDE you prefer (such as Atom or Sublime). If you still want to use VIM or NANO, please check documentation on VIM and Nano.