Yes, an Org Admin can modify users' profiles. 

  1. Click the 'Users' icon on the sidebar to your left. You can see the list of users who are part of the organization. Click on the user whose profile you want to modify. On the top right, you will see a button—Edit Profile. Click on it to edit any field. 
  2. You can also edit the Organization Role of a user by clicking on the pencil icon present next to the user’s role.