can't find where to set delay on a stereo linked mix output

Hi folks,
I want to set a delay on a stereo “linked” mix and can not find it,
even after looking at the SQ6 PDF manual, I still can not find it.
Thanks in advance,

It’s in the “top” screen of the Mix’s master isn’t it? Not in front of a desk at the moment, but it’s certainly there on the iPad.