Thanks, srlawr uk. I didn't find that section in settings, but I did disable all the Playgrounds 6/7 that I had made. The one Trailhead Playground left active is one activated in a Trailhead module, not the one that was created in the DE. Now I understand that Trailhead is an independent org, as is our Production environment, and that Trailhead Playgrounds are not the same thing as a Production sandbox. I am now having difficulty logging into the Trailhead org seperately as is recommended during challenges. I have always just used my production credentials to log in (not realizing that then changes made during Trailhead challenges would go live in our production environment...I figured I was in Trailhead...) In the Module named Trailhead Playground Management-the 3rd section requests that I connect an app from the app exchange). When I try to open Trailhead in a new incognito window, it pops up a login screen, but when I try to log in using the one Playground I have activated (which I just reset the password on today). I get an error saying that I either have the wrong username or wrong password (which I already verified with support were correct...) Also when doing this same module (Trailhead Playground Management) The section that describes how to change your password on a Playground indicates that I should see a settings gear when the login screen appears, and that bar where the settings gear should pop up never appears.  What am I missing? Maybe I am assuming that logging into my Trailhead Playground is the same as logging into Trailhead, and I still need to set up sign in credentials for the Trailhead org? Not sure which hoop I am missing. Also not sure the developer forum is the best place to post this...