You can add seasons to your TeamPages website in the seasons area of your settings.
Fill out the form that pops up. Whichever season has the blue dot highlighted in the season list is your current season.
Your seasons will display on all pages in the left column. This widget is not optional and cannot be moved to a different location. Users can click between seasons if needed using the dropdown menu.
You can message everyone from a past season when sending a message. Select the season you wish to message before clicking send.