Modify or remove events via the Your events menu in the Point & Click Editor:
Click on the event in question to:
Rename the event
Add or remove properties
Add or remove elements
Change from tracking the event on all pages to just one page, or vice versa
To delete an event, hover over the event name and click the trash can icon:
Deleting events will remove the event from your reports. If you later realize you need that event, you can always recreate it and see all historical data again.