Need Help to Remove Some Holidays – US Holidays - cals with flags Review

I like this app and while it’s wonderful to see a bunch of random and unfamiliar holidays, I cannot figure out how to delete unwanted holidays. I really do not care that today is National Blueberry Popover Day, for example. I would really like to remove all holidays except for the US Federal Holidays. The description implies this can be done, but I cannot figure out how to do this. I also could not find any way to contact someone for support other than by writing this review. If someone can tell me how to remove unwanted holidays from my calendar, I would really appreciate the help! Using iPhone and iPad.
Review by Samagram757 on US Holidays - cals with flags.