To edit a Case Background, head over to the Case Card, Details-view, under the Background section.
Click the Background field and enter the information you want.
After editing the Case Background, save the change by clicking anywhere in an empty space.
1. Ensure that you are either a Case Manager, a Client Manager, a User with 'Assistant'-role, and a User with 'Administrator'-rights set up to be able to make changes on Case Card.