Need help with manual uninstall

I am attempting to manually uninstall Audacity and do a reinstall.
In doing so, I have located/moved 1 Audacity item file from Application Support to trash…and 2 Audacity files from Preferences to trash.

When I attempt to empty the 3 files in trash, 1 file remains in trash with this message:

The operation can’t be completed because the item
“org.audacityteam.audacity.plst” is in use.

Thanks in advance for any and all help!!

Try shutting down all applications, then shut down the computer and reboot.