Below are some tips that might help when you are seeting up SI Play at the start of the season.
First, you may need to log out and log back in, if you haven't done so in a while.
To choose your team, go to "my teams" at the bottom of the page.
You may notice that you aren't seeing the right team. Now what? At the top of this screen you'll see each of the teams that are "on" in a bubble (in this example, 7B), a plus sign to create a new team (don't do that), and that other mystery symbol to the far right. Select that one. (It turns out they are "on" and "off" switches).
This takes you to a list of all your teams, past and present. Turn off the old teams, and turn on the new one (hint: this year's teams all have "2018" in the name).
You should now see this team in your main "My Teams" page and have access to rosters, schedules, and more.
That's it! You are now on your way to being a pro at using SI Play and RSVPing well in advance of every game. Test that out by RSVPing to the whole season right now!