Setup
It's a one-time setup you have to do during App onboarding.
The app would not need any further tweaking.
1. In your Shopify store admin page, click on Settings
2. Click on 'Checkout and Accounts'
3. Click on 'Checkout Editor' in the right window pane.'
4. In the checkout editor, Click on 'Add App' from the bottom left of the screen
5. Select our app Ace from the list of apps
6. Click on 'Save.'