Cant add variants to cart

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Im trying to get the first product on the home page to jump directly to cart page when they click it. The second product which is on the link i provided and the menu called "HEPA Filter" is the product i want to fix buy button to a add to cart button function. I dont know much about liquid or html. The store consist of 2 products total.

1x air purifier (2 variants) (grey) (silver)  (home page) want this one to add to cart then redirect to cart page.

1x Hepa Filters (4 Variants) (menu button "HEPA Filter")want it to just add to cart and no redirect to any page.

Haven't been able to find somebody to solve it.