The setup in Lightning is easy - just add the Component to the page:
In the Top Header click on the Setup button and select "Edit Page":
Lightning Setup - Edit Page
In the Lightning App Builder, just drag the CheclListAdd component to the area you want to add it to:
Drag the CheckListAdd component to the page.
If you do NOT see the component, make sure that you have MyDomain enabled.
If you have not MyDonain enabled, you can still follow the Classic Setup and add the Button as a Lightning Action in the Page Setup.