Greetings!
I am a coach and consultant. In a Trello account owned by a client, we can add due dates to check list items.
In my own Trello, in which I am the only user, adding a due date to a checklist item is not where I know it to be from using my client's Trello, i.e., the three dots on the right side of each item. See the screen shot.
Thanks for your help!
John