Tips for searching efficiently on Shopkick?

I'm getting started with these apps, I'm doing okay but I find myself always searching Shopkick last because I can't figure out how to search efficiently. Do you have any advice for me?

As far as I can tell, I can't search by product or see a list of offers by product category; I have to select a store, then a rewards type, then a product category. (Let me know if that's wrong.)