Maybe some visuals will help.
I go to Monetize, choose an app, Ad Units and am shown this:
Now, I want to add an In-House ad to the Progress page, so I choose Edit mediation:
Nope, can only create a whole new in house ad campaign. But I already have one created in the Promote area.
So I head to the promote area (as you suggest):
And can only edit where this in house campaign is already appearing.
Other then re-creating a whole new in house campaign, how can I take this one - which already is in two places (I honestly have no recollection as to how I accomplished this) - and apply it to these other (new) ad spots?
Thanks
B