After you have completed the main setup and the setup for the onboarding/offboarding/transitions you can create your checklists.
The checklist needs a name, an owner, a description, a calendar and a process type. Then you can start adding tasks and grouping them
The checklists needs to be created (if you didn’t do that in the setup. You need to give it a name and connect it to a calendar.
You create your checklists by adding the tasks to the checklists.