Doing Something Else
In the game, you can try anything you think of, although that doesn't mean anything is possible. Guided by logic, you and the GM will find all kinds of actions and options that aren't covered by a rule. That's a good thing.
You shouldn't feel limited by the game mechanics when taking actions. Just because you don't have a skill doesn't mean you can't attempt that kind of task. For example, even if you've never picked a lock, you can still try; the GM might hinder the task because of your inexperience, but you can still attempt it.
Remember: your character is not just a piece on a game board with a specific list of things you're allowed to do. That's why this "Doing Something Else" section is in the book. Like a person in the real world, you can try anything you can think of (even if succeeding is impossible).