These users are referred to as Authors. You can add new Author users either in your ClickLearn Administrative portal or in the Team section of ClickLearn Studio.
Please follow this guide to add Authors from the Administrative portal.
Please follow this guide to add Authors from ClickLearn Studio.
Learn more:
ClickLearn Documentation: Managing your Team
ClickLearn Universe - Collaborating in ClickLearn Attain
ClickLearn Universe - Managing Users