Click the yellow button near the bottom middle portion of your hud
You can set a keymapping in the config menu (escape).
As for increasing your power output, you can purchase Engineering skills such as basic engineering or another one called 'power grid usage' or something similar. If there's an item that modifies any atribute on your ship, there's probably a skill category you need to learn before being able to use it. Engineering will give you an increase on pwoer output per level. But, imo, you're better off buying a better ship. That 5% doesnt really do much with early characters