I want to have an in-game tutorial but not sure how to do it.

Basically, I want to use a trigger box and when you enter the trigger box the game pauses and text displays on the screen telling the player what something is in the game. I’ve set the game to pause when the player has entered the trigger box but can’t add text.

All you should need to to do is just create a widget which will contain your tutorial information in it when the player has entered the trigger box.