How do I integrate ParcelsApp for tracking into my shipping template?

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I went on YT on how to get a free tracking page found a comment of guy coding in the parcelsapp so gave him a message he said to just paste it in a new page in shopify. The code does work, I have klaviyo in the shipping template how can put in parcelsapp as the tracking company. When a customer wants to track their order they can just press on the link and it will take them to the parcelsapp?