For Athletics Champs, I would advise you to use a template, so that all settings are correct with one click. You can do this via the right menu > copy settings > copy from a template. Then select an athletics champs template.
If you only want to enable the teams, you can do so via the right menu > results settings > Base team results on. Change that option to something other than "Do not use teams". After saving, the teams will become visible and you can create teams yourself.
This has been automatically translated into English