repl is an online IDE (Integrated Development Environment) where you can create and share projects and simple programs, using almost any language. Create an account on repl.it using your traing centre account. You may use an existing Google or Github account if you prefer, but be aware that the email used may be visible to others if you do so. Also be aware that your training centre account will expire after you leave this course.
Once you have your account you will be able to write and run code in the IDE, or copy/paste your code to a new Python repl. Then you can send a link to that code for someone to review or comment on it. It is the easiest way to do it, and it also lets you have a way to save your code online.
You will have access to an Invite link which you can use to join the repl team. The short video below is a nice introduction to many of the features available in repl.