Hello

What the proper way to modify MLF ?

You want change the HTML and CSS to give your forum another look or mobile-device-awareness?

I means, must we modify the files int the /template directory ?

Please don't. Copy the default theme in /template/default/ to a new directory in /template/, give it a proper name (it's used in the settings pages) and apply your changes to the copied, new theme. During development it's recommended to set the new theme as your personal template in your user-settings-page and not in the settings page of the admin-area.

And then compile them before putting them into /template_c directory ?

No, there is nothing to compile. If you ensure to load the latest changes from the server, delete the content of /template_c (not the directory itself) before loading the changes in your browser.

Tschö, Auge