Starting a sandbox league

I joined, donated $20, and started a sandbox league. I’d like to create my own four team league, using entire historical teams (e.g., 1967 St. Louis Cardinals). I’ve used the Commissioner’s tools to edit league settings and thought I had imported four entire historical teams, but cannot find any evidence I did so successfully. Still feeling my way around. I’ve watched the You Tube video twice and it helped some, but I’m still trying to get things going. Any guidance or insight is welcomed and appreciated. Thanks!

You might have imported them to free agency. You need to first create the teams, then import the players to the correct team