If you plan on collaborating with someone frequently, you can assign a default role for that collaborator. By checking the default role box, Cosynd will automatically assign that role to that collaborator for all future agreements. You won't have to enter this information again whenever you work with that collaborator.
For example, if a collaborator will always be the producer of the songs you create together, you should select "producer" as the collaborator's role and check the box "make this the default role for this collaborator."
You can also change the roles selected for each collaborator when you are finalizing your agreement later on.