1a. Once in your administrator side of your website go to "Settings".
b. Click the gear icon in the upper right corner of your menu
c. Click on "Redirects".
2. Click "Add a new redirect".
3a. Type in the rest of the URL that would have been used for your old site.
b. Type in the rest of the URL that is now used on your new site.
c. Click "Save redirect".
4. You have now created a redirect link.
You can delete it by clicking on the trash icon.
You can also test the site by clicking on "Test this redirect".