Managing up is primarily about communicating your priorities and seeking feedback about them from your manager. Rather than wait for direction or live in ambiguity, managing up is about you taking charge and define the direction you wish to go in and seek feedback and alignment on it from your manager.

While the ability to do this with your manager is a crucial skill at the workplace, you don't have a manager outside of work. You report to yourself and are answerable to yourself. 

Outside of work, managing up simply means to internalise your locus of control. Rather than wait for the circumstances and the environment and the others around you to define your goals and priorities, you take charge and define them yourself. 

Start managing up.