CA Unable to modify a search thats setup

We are running CA 10.0.4 and have searches setup on a daily schedule to collect the emails against the hotword for the compliance team to review. 

They have started providing email addresses to block, so i can see we need to do this under the freeform email addresses area. 

I created a new search to test this, which is fine and works - but I am unable to go back into the search and modify the email exclusions to include any new ones that they add..

I have created a new role that has all the permissions selected and it still doesnt allow me to modify the search.  Is this a restriction of the product or is there a way to do this and to also remove old searches under the search screen in Departments?

Any assistance gratefully recieved!