Another helpful tool is the Search iBandstand field directly above the chat. There's a drop down box for searching the forums for topics such as editing.
As well as finding artists, songs etc.
And there's a 5 minute editing window on comments. https://www.ibandstand.com/topics/92
The Edit and Trash buttons are partially hidden by the ad to the right. I managed to hit the edge of the edit button and archive a song, but I can't get to the Trash button. I'll try another browser and see if that works.