You can create a "Public link" of your lesson to share with parents and pupils. Once they click the link, they will be able to access and interact with a Preview of your lesson which contains all the slides you have created.
First, head to My Lessons, click the Action button (three dots) and ensure the lesson is set to "public".
This should bring up the "copy public link" modal which you can copy and paste to send to parents and pupils.
Your lesson will now appear as "Public" in your list.