Sorry I was being hasty and didn't add "type in the summits box and an option will appear to add new if nothing is found" but perhaps you'd got this far already
In the same way you would add a route, at the bottom of the hill page there are two buttons "Add a missing route" and "Upload a file of missing routes".
You can also create a Route Card, which is a more detailed walk, and once passed through moderation, will be on the UKH Route Cards page here:
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