How to change the user for score PM notifications?

[Wabuf]

I am using 2.5.7 and cannot find where to change the user for PM notifications.

[G_Man]

While in the arcade there is a link for: Your Settings

:D

[Wabuf]

All I see is turning it on or off, I want to change the user who sends it out. It used to be under my account, but when I updated, the user who sends out the PMs, is one of my regulars.