Need to install a private app

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Where to this type of https://e8d9b575d509065b183d99e9ab65d5bf: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@tafari-wraps.myshopi... to authenticate the private app. I have the API key, Username, Password and secret of the private app which was created by the other Store admin.

I am not a coder, so kind of novice in this context. Can you guide me please?