SUN-MAID Natural California Raisins, 64 Ounce

Q: Are these jumbo or small? Do these contain any additives such as sulfur or any other ingredients like oil?

They are small. There are no additives.

Q: How do i add these items to my cart? i don't see any add button.

Over on the right near the top, it defaults the button to "Subscribe and Save". Change it to "One-time purchase" in which case the "Add to Cart" button should show. As a web developer myself, I believe this actually is poor design by Amazon. They should default it to the "One-time purchase". They think they will sell more this way, but I suspect they lose sales to others like you that don't notice this. The Subscribe and Save is used for many products, so you will see this often.