Click 'Careers Site' on the top menu bar to go to your company's Careers Site.
On the left side of the Careers Site, click 'Careers Site editor.'
Then click 'Site address / Domain' in 'Advanced Settings' section.
At 'Careers Site address' you can pick a new URL for your Careers Site.
Click 'Save' when you are done. The Careers Site's URL should be changed immediately.
If people visit your old Careers Site's URL, they will be redirected to this new URL.