An 'Enterprise Admin' manages the administrative side of the d!nk tools. He or she needs access to the Portfolio Manager to add content, request insights, manage the users and much more.
To be able to give this role to one of your colleagues, you will need to be an enterprise admin yourself. When that role is activated for you, you can go to the users overview:
And change the settings of the user by clicking on the dropdown in the user details and choosing 'Edit settings':
In the pop-up that appears you can activate the box for 'Enterprise Admin' to activate the role for your colleague: