Hi, you have to set the viewing of the files to icons, and then you have to click on the window, not over a file. Then the option "open in terminal" appears.
> bash: nano: command not found
Depends on your distro. Ubuntu/mint:
sudo apt-get install nano
yum install nano
Running from terminal, you do "ls", the file must be listed, the do:
or, if DDLC.sh is in your current directory and it is executable, precede it with ./ (or else Linux will only search for it in directories in PATH):