Website fixing

I have a website at www.eoxshowcase.com. On the same hosting I have different domain. www.kidstoothbrushclub.com. I need second domain ([login to view URL]) to display website that is located on first domain ([login to view URL]). I was told by the hosting that all it takes is to copy the files to hosting subfolderm install search and replace wordpress plugin, change the addresses from [login to view URL] to [login to view URL] and point other domain to that subfolder. This also might be completely false. Also, when people click on the checkout on the final checkout page I need pop up on the come up and offer users 2 choices: 1st: add one specific item to the cart (and quantity) and checkout 2nd: just checkout I need this done in the next 15 hours. If you go over deadline I will not be able to pay you for your work.