Hi Sam Thanks for commenting in our community! To add additional steps on this timeline you will want to copy/paste the rectangle shape and then circle. You can then edit the number in the circle and the color as desired. 

Hope this helps! Let me know if you have any other questions. 

Great thanks Whittney!

Suggestion: It would be so convenient to right click on any step and be able to add a step before or after.

Hi Sam yes I agree! We're always looking for ways to improve Lucidchart and your feedback is the best way for us to do that. Would you mind adding your idea to our feature request form? Ideas submitted to this form are passed on to the product development team for their consideration. Hope you have a great rest of your day!