The name of the cheese may be Chihuahua cheese, but if you cut it up like cheddar, mozzarella, or something else, chances are it will all melt!
Give it some time to warm up. It might not be quite as good as regular cheese because its texture is different–but at least you’ll know for sure!
You need to leave room in the fridge like with any other type of cheese. Stick with blocks (rather than sliced) and put them on low shelves where they’re away from the light that could affect them; then they should keep for about 10 months. You can find this really yummy Mexican product in most supermarkets now that have a good selection of Mexican food products…