Build a Website

I need help making two small updates to my Shopify template. 1. Install ajax to the cart to allow customers to stay on the product page after adding a product to their cart. Currently the website automatically takes the customer to checkout. 2. For some reason the links at the very top of the page are disabled. I think it's because I have an app that conflicts with the code but users cannot login or logout of the website. I need these two tasks completed right away. I would like to hire someone that I can keep on retainer for projects like this on a semi-regular basis. I need someone with good English skills, coding skills and willing to work for cheap.