Where & how do i get codes on the internet for recoding a remote control that was sat on by mistake?

That depends on the make and model of universal remote. Most manufacturers of universal remotes these days have webpages that contain the users manuals with all the codes and instructions in them. Others have toll free numbers printed on the remote you can call for assisstance in finding the code. Others may have real basic instructions underneath the battery compartment cover that shows how to program via the code scan method.