swift when I try to make an action with my tab bar item, I can only make an outlet or an outlet collection how can I make an action?

I am making an app with 4 tabbar items. one of them has a WebView and on the website there are buttons that go to other things on the website or to an other website but how can I make it that if I press the tab bar item again that it goes back to the first view (like the app store when you press the tab bar item again you go back to the beginning). when I try to add a insert a action I can only choose between make an outlet or an outlet collection.

thanks for reading this, I hope I gave enough information to understand my quistion.