Removing RSS feeds

I’m a fairly infrequent WP visitor who messes around with his blog and then forgets what he has done.

A year or so ago I set up some RSS feeds (incoming) one of which now returns errors. I would like to remove it but can’t find the appropriate control panel to do so in admin. I’ve spent two days on this now and read the CODEX back to front. Does anyone know where the controls are hidden?

I simply want to remove one RSS data feed from the list.

Help…

Please…