To enable magento path hint for your magento website first login into your admin section i.e magento backend now go to System->Configuration->Developer
Inside this you have to Debug option.If the Current Configuration Scope is Default you will be not able to set template path hints for your magento website So change to you website after this change Template Path Hints to yes.

Your Template path hint has been enabled after this you can view template path hint on the frontend of your website if some how due to cache you are not getting the path hint so go to System Cache management flush or refresh the cache are you are ready to go.