Lists appear in several places on Makerble:
Contact Forms
Event Creation Forms
Event Guest Booking Forms
Surveys
Although in some instances you can create a List while creating or editing a form, you cannot edit an existing List while creating or editing form.
To edit an existing List, you must go to the appropriate app.
How to edit an existing List
To edit a List that appears in a Contact Form, Event Creation Form, Event Guest Booking Form or Survey, go to the Lists App (steps described below)
To change which List is used as the set of answer choices in a Multiple Choice Survey Question, go to the Goals App and follow the steps to edit a Multiple Choice Tracker. But if you want to simply edit an existing list, go via the Lists App
Steps
Go to My Apps in the top menu
Select Lists
You arrive on the Manage Lists page
This displays the Lists that are owned by you or your organisation
From here you can click the Edit button next to a List to edit that list
When you click edit you arrive on the Edit List page