I just saw a LucidChart video on Sequence Diagrams and it showed drawing a line between lifelines on a seq diagram. I can only draw lines to and from Activations .... how was that done?
Also the video showed a person icon with a lifeline (ATM example)... how did you do that? There's not one available in the UML Sequence Diagram shapes.
here's the video: https://www.youtube.com/watch?v=pCK6prSq8aw