I have found the answer to my own question. The setting for the difficulty level is not under "Manage Chess Engines" at all, but under Left Menu > Settings > Engine Settings: Playing Strength (0-100%)
More importantly, I needed to SCROLL TO THE TOP. It was not obvious that, when I entered Left Menu > Settings, the options did NOT start at the top. (I had probably scrolled down to the middle, sometime ages ago, and it had remembered that.) Realizing that there were other settings which had scrolled off the top, I was able to find the settings. I was finally able to set the Stockfish playing strength to 0% and beat it.
Okay, guys, stop laughing at me.
Glad I found the setting. Hopefully this helps others.
I can't seem to set the difficulty level of Droidfish (with the Stockfish engine), so that Stockfish keeps playing at full strength and slaughtering me each time. When I search the web for help, all the answers say it's a simple matter of setting the "difficulty level" or something similar, but it seems that my Droidfish simply doesn't have the "Difficulty Level" setting. All I see are "nodestime" and "threads" and "minimum thinking time" (what I want to limit is the "maximum thinking time").
I'm going to try attaching a screenshot -- is one of those parameters actually another name for "Difficulty Level"? Is it already set for the lowest level and I just suck a lot (which would not be surprising)? The screenshot is reached from tapping on the left upper corner and selecting Manage Chess Engines, and then Settings (for Stockfish; if I choose the other chess engine, Cuckoo, the settings are different --and far more limited).
I've just upgraded Droidfish to the newest, v1.77, a few hours ago, and it's the same.
Thanks for any help you can give.