In Heartpace only a user with Primary Company Administrator role(PCA) can do it. Usually it's a CEO, HR or admin who is responsible for Heartpace in your company.
It can be easily done in Company Settings - Roles and Accesses:
Or find the user you need in Gallery and click Settings on his profile page:
Then you can assign a user role to him by putting a checkbox where necessary and click save to apply changes: