Simple Zencart Fix(repost)

I need a zencart guru to fix a minor problem occurred with my zencart site. The problem is we are not able to add products to cart. When user click on Add to cart button nothing happens. This is not the issue all over the site but happens for some of the products. Previously we had issue with products that we were not able to edit those products and after that fix this issue seems to appear. For all other products where we are successfully able to add products to cart we get error when products added to cart on the cart page. This is the error we get {You may want to add some instructions for using the shopping cart here. (defined in includes/languages/english/[login to view URL])} You have to troubleshoot and fix it and also make sure we are able to add/edit products from admin and no further error occurs. If this goes well i will need u to work on many more coming projects.