Trying to edit the BPM notification but no edit option is enabled

Summary:

I am trying to edit a BPM location for change location approval. I have created and entered into the sandbox, then when i am trying to enter the BPM worklist page, it open a new window but out of sandbox. I searched the task in administrative task and opened it. there is no option for editing the notification.

Does anyone have any idea or any configuration document that can guide me how can i edit the notification…!!

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