Step 1: From the Pricing page, click on the Upsell tab.
Step 2: Click "Add Upsell"
Step 3: Select the Product/Bundle you wanted to be an upsell
Step 4: Enter the Headline and Description
Step 5: Click "Go to Customize Upsell Page"
Step 6: Click the Edit icon.
Step 7: Customize the page as desired using the option on the left.
Step 8. When everything looks good, Click "Save & Exit".