If you are asking about the url of the hub, ITSELF, that cannot be changed. You can edit the title (and it does not have to match the url).
You can copy and delete the original hub-- then start from scratch with a new url, but I think you will have to wait until the old version is de-indexed by Google before posting the new version to avoid duplicate content warnings.
(If you are talking about links within the hub. Go to edit mode. Find the capsule with the link. Go in to edit the capsule. Highlight the link. Click the unlink symbol. Rehighlight the linking word or phrase, and add a new link.)