To change a supporter's permission, you have to delete the supporter and then re-invite the supporter with the new permission.
NOTE: This will not delete their account instead, they will receive a pop-up to accept the new permission when they log in back in.
To change a Supporter’s permission
Delete the old supporter permission by clicking on the red X.
Re-invite the supporter with the new permission.
Type in the first name, last name, the email, and select the new permission.
Click Invite. This will send an email to notify the supporter.
Once the supporter logs in a pop-up will appear to accept their permission.