In the Workflow task assigned to manager when he is selecting for the “select action” and selects the reject in the drop down i want to add 1 text area for rejecting the form so that manager can enter manually why is he rejecting the application of the user.

I know the task assigned to the manager in the task can noy be edit but is there any other option we can do to solve it.

Please help me with this it is more important to me. 

And 1 more thing is that I want to change my email for the community portal that I am logging here to my new personal email is this possible or not please tell me the exact step to do both the task.