Correcting 301 redirects within shopify

We've just migrated to shopify and we have a lot of redirects. Unfortunately I used an app to create mass redirects but I just learned that the redirects I created are sending users to their site and then redirecting them back to my site. So I need to delete these 1,600 redirects and add them again with a url from our site. So here is what you'll be doing. 1. Searching for the redirects within the shopify 301 redirects area that send users to the other site. 2. You'll copy the old url. 3. Click on the redirect so you can find out what the new page is. 4. Delete that redirect. 5. Click Add new redirect. 6. Paste the old url 7. Go to the page that you opened that has the redirect that is sent to the other site. 8. Copy that url 9. Paste that redirect back in shopify I have around 1,600 redirects that need to be deleted from my store and fixed.