If you are on Recharge's Shopify Checkout Integration, these widgets will be created and displayed on the Shopify Checkout page (A Shopify Checkout Widget).
You must have 'Recharge Checkout' selected in the Recharge integrations tab.
In the 'Widgets' tab, click 'Recharge Customer Portal', then 'New Widget', and then 'In Checkout Recommendations':
Configure the data source.
Follow along with the install instructions linked to the install button in the widget editor:
That's it! After following the install instructions, mark the widget as installed and test it out on the Recharge Checkout Page!