unlocking file(s) on Ventura SSD

I changed permissions on two files. When I opened them, they remained locked. I then did this: 1) open Terminal

2) paste: sudo chflags nouchg

3) hit spacebar to add one space

4) select all locked files from your HDD/microSD/SD and drag&drop them into Terminal

5) hit Enter and it's done!

It asked for a password, which I couldn't enter. I then tried this:Let's say your mounted device is named STUFF:

sudo chflags -R nouchg /Volumes/STUFF

This recursively walks down the content on that mounted device unlocking everything on it, including folders and files. It asks for a password, which I can't enter. Can you help me?