Currently, you are unable to edit an Active survey that is in a community. The page states that this restriction is in place in order to "preserve the integrity of the data". However, it would be useful if we were able to edit the Triggers page, specifically the time frame and/or the "Email Subject Line"/"Email Body Text". This would not impact the integrity of the data but would ensure that we are able to maintain consistency in survey administration and are able to customize messaging rather than creating an entirely new survey every time.