Hi Annabel
We had the same issue a while back and here is the solution we found:
Go to Settings -> Permalinks and choose “Post name”.
All your existing URLs will change and most likely already redirect to the new URL.
If they don’t redirect you need to use a plugin like https://www.ads-software.com/plugins/redirection/ or https://yoast.com/wordpress/plugins/seo/ (You need Premium here to do redirects)
The first one (free) is good because you can import from .csv format.
It is very important for SEO that you redirect all your domains, so please don think lightly on that task ??
Feel free to message me if you need any help or have any questions.
/K
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This reply was modified 5 years, 11 months ago by Andrew Nevins. Reason: Redacted link back to site