I guess you mean in jsreportonline.
Please email me the details, we do this manually at this moment.
I just need to warn you first. Don't you use this email in auth headers of your API calls to jsreportonline?
If it is the case, changing email would break them.
The common solution is that you create an extra user in jsreportonline studio and start using it in your API calls.
Afterward, it will be safe to change the email address as requested.