I followed it to the T, but the "Not secure" thing in Chrome is still there.
opkg update && opkg install openssl-util luci-app-uhttpd - Done
/etc/ssl/myconfig.conf with the following content: Done.
IP.1 = 192.168.2.1
Step 6, 7, 8, 9, 10 Done. Imported mycert.key to Trusted Root Certification Authorities store in Chrome, and restarted browser. "Not secure' msg still there. Urg. Will redo.