Add Co-Owner or update permission of collaborator

 To Update existing collaborator permission follow the below steps:
                1) Login to Box and select the shared folder. For Example: B-Test is a shared folder and I                                                         am updating Animesh Kar permission from editor to co-owner.
                2) Click on Owner's name.
                 3) Click on collaborator permission and update it as per requirement.
 To Add a new co-owner.
                1) Login to Box and select the shared folder. For Example: B-Test is a shared folder and I                                                         am updating Animesh Kar permission from editor to co-owner.
                2) Click on Owner's name.
                3) Click on the share button from the upper right side.

                4) Enter the name of new collaborator and select the permission type.