How to edit custom goals
Navigate to your campaign's settings area via the left side menu, click Goals at the top, then click the name of the goal you would like to change.
Alternatively, you can edit the custom goal from your dashboard or report directly by clicking '...' at the top right of the widget, then selecting 'Edit Goal' from the sidebar.
This will pull up the Update Goal page, where you can edit the custom goal fields. To save, click Update at the bottom left of this page.
Once saved you'll see the custom goal widgets updated with the changed information.