You may modify your offering at any time.
All you have to do is go to "Publication" > "Data offerings", find the data offering you want to edit, then click on "Edit".
While you are making changes to the URLs, the data offering is unpublished, and cannot be acquired until you have completed, tested, and republished the data offering.
What aspects of the offering can be modified?
All aspects for your offering may be modified even after the offering is created, whether it is published yet or not.
For a file or subscription data offering, you may not remove data from your offering immediately if there are transactions in progress with one or several acquirers. You may only remove data once all the transactions are complete.
For a published Pull API data offering that has been acquired and for which you wish to edit the URLs, consult this article.