You're apparently clicking the wrong link.
Click on Edit Listing, then click modify your cache coordinates via a log entry.
I did do that. I had to pick a log type. The first one was a reviewer note. I just did another one in the form of a regular note. It still looks like it is in the wrong place on the map and the coords at the top of the event page are wrong. Why cant I just change the coords on the top of the page. I dont want to add more waypoints, I just want to change the coordinates to where they need to be. Im not new to this game, I have hosted a pile of events.
Click on Log my Visit, this is the same link you select to log a find on a cache. You need to pick the log type of Edit Coordinates. Then in that log click the "has a waypoint" box and fill in the new coordinates. When this log is entered it will change the coordinates.
I think that's the confusing spot. When the "Updated Coordinates" type is selected, there should be some javascript in there to automagically check the "Has Waypoint" box and show the coordinate fields. I would never have guessed it otherwise.
For the record Jeremy forgot to include the "edit coordinates" log type to events. There was the problem. I feel much better now. all is well.