Every ticket must have a title, you can change this title into a link. Indeed, if you put a link on the ticket, you can direct your article to a page of your website who will give more details or to a other website.
The thumbnail match with a little image that you can put in order to brighten up your ticket. Publishing date is blocked on the current date. Right now with the current version of Web Creator, it is not possible to change this date. However, if you really want to insert articles with a different date, you will have to change the system date of your computer.
Add so many tickets that you want.