From your AppScenic Account, go to My Products then View My Products. 

Find the product you want to update the price formula for. 

Now, you have two options to go on:

1. Click on the title of the product to land on its page. 

On the top right part of your product’s page, just under Product Groups, you have Price Formula and Returns. 

Now, click on Price Formula and choose the one you want for your product. 

Click Save and you are all set. 

2. From the My Products list, select the product you want to update.

On top of your product list, you can find the tab named Update Price Formula.

Under Update Price Formula you can choose to either add the product to a specific price formula or to your Default Price Formula.

Make your choices and click on Apply.

And this is how you update the price formula for a product. :)