How do I add margin?

To add a margin-  

1. Select a catalog
2. Click on the product you want to sell
3. Select ADD TO CART
4. Choose size and quantity, and then click on DONE
5. Go to Cart
6. Choose a payment method
7. Enter your customer’s pin code to include the shipping charges, and then click on CHECK
8. Now you will see the total price, which is product charges plus shipping charges
9. Click on Proceed
10. Select the customer’s address or add a new one
11. Click on Proceed
12. Select the existing details or add a new one
13. Click on Proceed, again
14. Here you have to enter the final amount that you want your customer to pay This final amount is the product charges + shipping charges + your margin

If your customer has confirmed the order, click on Place Order.