Allow others to help manage your content, exhibits and publishing options
Click Manage Users on the 
Administrators
Administrators can manage every aspect of your account, including uploading items, curating exhibits, inviting other administrators, and even deleting it entirely. ​
Curators
Curators can only manage their own exhibits: They can create new exhibits, as well as edit and delete them. Curators don’t have access to your exhibits, items, settings or any other part of your account. Curators use a separate exhibit curation tool at https://artsandculture.google.com/story-editor/
Users you invite must already have their own Google Account, otherwise you will see an error message. If necessary, ask your new administrator to create their own Google Account and then provide you with the associated email address.