Once a Form has been published, you can still access it in order to make changes to it.
Note: Changes will affect new form submissions only.
Follow the steps below:
Using the menu on the left-hand side of the web console, click on the item called Forms.
This will open the Forms page, which displays a list of existing forms.
Locate the form you would like to edit.
Click on the title to open the form in edit mode.
Once in edit mode, you are able to make the changes as required.
Click on Update to save any changes made.