These actions can only be performed by the Primary Account Admin user (with the Account Admin level users also able to perform these actions for certain user types on the account e.g. Team Members. Account Admins cannot manage role permissions of other Admin users; only the Primary Account Admin user can do this).
Log into your account, navigate to the Business Account Settings section of the application.
Navigate to the Your User List sub tab.
You will see a list of the users associated with your Business Account. When you hover over the users in the list, you will see an Edit pop up in the User Type column where you will be able to change the Role of the user which will update the permissions of that user in line with their User Role Type.
See the user role types and permissions table for more detail on each user role type and their associated user permissions.