The hub you started should still be on your account.
Log into your hub account. Click on the "my account" link and you should see the title of your unpublished hub in the list. It should be in red text indicating that it is unpublished. Just click on the "Edit" button on the left next to the title and you will be able to edit your hub.
You can always save it without publishing it. You can come back as much as you need to edit it and publish it when you're ready.