If you are an admin or manager on an InVision V6 Enterprise account, you can change another member's role at any time. To learn more about each role, check out this article: Enterprise roles and permissions
Managers cannot change a member's role to admin.
To change a member's role:
Sign in to your Enterprise account and navigate to the People page.
Click the Members tab.
To the right of the user you want to change, click the drop-down and select the correct role.