Creative Kit photo editor works in Google+, if not in Picasa

This Quick-Tip is about using the Creative Kit, which has been giving me grief recently when I tried to use it from Picasa-web-albums.

For ages, I've occasionally used the photo-editor in Picasa-web-albums (the online version of Picasa) to edit photos so as to I've already uploaded, and care for to amend lacking changing the URL.   This editor was originally Picnik - until Google sold so as to upshot and replaced it with Creative Kit a while in the past.