If you wish to change the permissions of users on your team, you can do so through your account's settings by changing their user role.
Only Admins can change user roles. See more about Users and Permissions here, and here's how to find your user role.
All Admins have the ability to change user roles. You can change any user other than yourself.
Click your team's name to toggle the dropdown menu. Select Team settings.
On the Team members page, click the dropdown menu next to the user you'd like to change. Click on the user role you'd like them to have instead.
If you don't see the dropdown menu option, then you likely need Admin privileges. Reach out to one of your team's administrators to ask them to change your user role.