I wanted to keyword properly some images for iStock, and got message about missing ESP API key / secret, I can see it needs to be inserted into the Sites settings box here:

But where do I find these values (key / secret ) on the esp site? I did look everywhere...

Or I shouldn't even bother with iStock and Stock Submitter, as I read the other post saying they don't accept stock submitter photos? Or I can still manually upload everything, just not submit it automatically