This isn't a HelloMix problem as you can make this happen through your backend. What you need to do is go to the backend of your magento store, select your product you want the options & add to cart show to the right of the product image. Click on the Design tab and where it says "Display product options in" select "Product Info Column". Click Save and then look at your product the options and Add to Cart should show to the right of the image.
Let me know if that worked.