To install the application you simply need to follow the steps mentioned below:
1.Search for the application-Simply Upsell on the Shopify Store.
2.Provide your Shopify Store URL.
3.Click on Login.
4.You need to subscribe to the basic application plan.
5.The application is installed.
6.Go to settings enable simply upsell post purchase.
7.Create upsell and utilize the application.