Thank you. With vision and hearing problems I struggle with videos, but I managed to navigate through that. I didn't get the set-up and log-in dialogues, so I imagine I did that some time in the past (probably by accident). The video said Setting would appear in the OneDrive icon in the task bar. There is no such icon in my task bar. I'm not even sure that I need access to settings....
That word 'error' in the path worries me. My other concern is OneDrive's location. It seems to be under Users in the C drive. The C drive's available space is much smaller than my files, which are in a D drive partition. (There is a single hard drive). Until I acquired this computer I always kept data on a second hard drive, where they would be recoverable if the system drive ever failed. I have been backing up by copying data to the second drive on another computer. I'm not sure what happens if I put all data in OneDrive. One thing that worries me (given my eyesight problems) is the possibility of accidental deletion wiping out all copies of a file.