I can't see how to sync with Shopify - how do I do this?

Shopify connected accounts must be created using your Shopify login - so if you have already created a separate StockTrim account you'll need to log out and connect via Shopify using your Shopify Store Name. 

Either go back to the StockTrim login page and click "Sign in with Shopify".

Or go to the StockTrim listing in the Shopify app store and click "Install" https://apps.shopify.com/stocktrim