You may be unable to edit Notification Alert settings to add Citrix Performance administrators

Workaround:
Please follow below steps given  as an alternate solution to the Administrator.

1. Go to Settings -> Email Distribution Lists -> Create Email List

2. Add the required users with Notification enabled

3. Create/Save it

4. Go to Performance -> Alert Policies -> Click the required alert

5. From the Select the email lists who will receive notification dropdown uncheck the default list and select the new distribution list with the needed admins

Problem Cause

It is by design to disallow the admin to edit the default administration list.