Open your website folder in your preferred editor. We would recommend Visual Studio Code.
Locate the folder ~/less/
Similar to working with standard CSS, you can open up the various files and edit the code to suit your needs. You don't need to worry about compiling the LESS files though, we take care of that automatically when you next visit the website in a browser.
Make a change to any LESS file. Save it.
View the change on your website using your preferred browser. YES! It really is that simple.