Once you've created a new checklist items, you have an option to edit it. Here are a step-by-step hint about how you can do that:
Step 1. Сlick on the icon to the right of the checklist field.
Step 2. In the Bulk Edit window you can:
Change the items and statuses.
Correlate the status symbol and the status icon.
Save changes.
Cancel changes.
Step 3. Edit your checklist as shown here: