My S Planner mini has disappeared from my galaxy core prime screen. How I can reinstate it?

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AC Question

I use my S Planner mini (the day as it is booked) that sits on my home screen of the galaxy core prime ALL the time. Somehow today it was deleted and I can't find a way to reinstate it. I still have the full calendar and no appointments have been deleted. I thought maybe I could just reinstall it but do not want to lose all the appointments already in.