Command line access

I have used the instructions 'Set up with secure remote access using DuckDNS and Nginx proxy' to set up HA on a Raspberry Pi and can access it remotely via a web browser.

I now need to access the command-line on the Pi to run some test bash scripts. When I use Putty to try and access on port 22 I get 'Connection refused'.

I may have found a solution. I have installed the add-on 'SSH and Web Terminal'.