If one of your pages has changed URL, you don't want internal links nor inbound links to it from third party sites (e.g., reviews or previews) to be broken. You can get around this by using a 301 redirect, which tells the browser or search engine that a page has permanently changed links. You can direct the link from the old page to the new one by using the 301 Redirects feature under Tools inside your Ozcart admin area.
This video shows you how by showing you an example of renaming a page in your website to a new URL and redirecting the old link automatically to the new one.
To view it in YouTube: https://youtu.be/dKnumty5Vqw
Or to view it here: