Note: This feature is inside the payment form in the Upsell section. If you want to know how to set up an Upsell, please read How Do I Set Up An Upsell?
Step 1: Find And Toggle On 'Only Show The Upsell Button'
1. Go to the left-hand side of Cartfuel, and under the Product Actions section, you will see the New Payment Form and Payment Forms buttons
2. Create a New Payment Form or go to Payment Forms and edit an existing one
3. Click the Next Step button 2 times until you reach 'Step 3 Page After Purchase'
4. Once you have designated the redirect URL, toggle On the 'Upsell Product Page?' button
5. Scroll down until you see the 'Only Show The Upsell Button'
6. Toggle On the 'Only Show The Upsell Button'