joomdle- my courses

Hi,
I want to modify the layout of the joomle- my courses page, I have tried to change the php file under mod_joomdle_my_courses/tmpl/default.php but I couldn't see the changes. Am I working on a wrong document? Can you please help me on this, thank you.

If you are trying to style the "my courses" view, you would need to modify:
components/com_joomdle/views/mycourses/tmpl/default.php

However, I strongly recommend not to mofify core files, unless it is totally necessary. In your case, you can get what you want using template overrides:
docs.joomla.org/How_to_override_the_outp...rom_the_Joomla!_core

With that you can change layout, and not loose changes when you upgrade Joomdle.