Hi there. To get the current season's artifact, you need to complete the introductory mission for Season of the Wish, called "Final Wish". Most players would be automatically launched into the mission the first time they logged in after the season started, but that may not be the case for a new player. If it didn't happen for you, you should be able to manually launch into the mission from the HELM map. After completing the mission, you'll be directed to speak to Mara in the HELM and will then get this season's artifact, the Queensfoil Censer.