It has been a long time since I tried to edit one of my ads.
It looks like I have forgotten how to do it.
So, I go to My Ads - Ad Units, and I click on the ad to edit it.
Everything is editable, EXCEPT the SIZE.
Since I have been hammered relentlessly to change my "non-preferred" ad sizes to the "blessed sizes", I thought I would change a few. No good.
Must I create an entirely new ad, in order to change the ad size? For each page? No way. That is just too much work. There are hundreds. Not to mention the issue of having to create multiple ad units for each slot on each page, mixing up channel data, etc. I got totally screwed up by doing this, once before. I don't want multiple ads for the very same slot. Unnecessary confusion.
If Google wants me to do all this ad size changing, shouldn't they make it EASY TO DO? Such as, making it editable?