Please Note
Discourse now automatically redirects renamed categories. I will leave this HowTo up for the time being to cover any eventual edge cases that the automatic redirect doesn’t take into account.
Say you’ve renamed the category /c/school to /c/education and you’d like to make sure all old links that point to https://forum.example.com/c/school will now redirect to https://forum.example.com/c/education. Here’s what you do.
- Go to /admin/customize/permalinks:
Here you should enter the partial URL of the category slug that you’re redirecting, in this case c/school
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Change the middle drop-down to Category ID 
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Now, in a separate window, go to your renamed /c/educationcategory and append.jsonto its URL, so that it looks like this:https://forum.example.com/c/education.json. On this page, search for “category_id”. You’re gonna want to copy & paste this number into your “Category ID” field.
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Lastly, enter the ID - in this case 10 - of the category. Before clicking “Add” your form should look like this: 
 


