In order to integrate PricingBot with Shopify, you will need two things: 

1) An account on Shopify with the permission to edit products

2) Your store name (not your public URL)  -> store-name.myshopify.com 

Then you need to go to this page: http://app.pricingbot.co/product/own_product/add 

Enter your store base URL in the input, click on Synchronize my store and authorize PricingBot.

Note that If all variants of the same product have the same price, only one will be monitored, the others won't be.