Need help with shipping from kincustom

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I want To use Shopify to make my own shop and use the Shopify kincustom app. The issue I’m facing is figuring out how to do the shipping, sin kincustom has a different shipping option.

Such as Shopify can be a flat fee, but to expedite shipping for 2 items on kincustom would be $11, and go up more if you keep adding items and I dont Want to lose out on money