You've got 16 waking hours in a day.
I'd try to consume 3-4 meals with 500+ kcal in them. You can probably get 700kcal, maybe even more, at dinner. Between your 3-4 big meals, consume something every 2 hours. If you eat breakfast at 6am, have lunch at 12pm, and dinner at 6pm, then go to bed at 10pm, this gives room for a small meal (200-300kcal) at 8am, 10am, 2pm, 4pm, and 8pm. That's 5 meals, averaging 250kcal each, totalling 1,250kcal. Add that on top of a 500kcal breakfast, 500kcal lunch and 750kcal dinner, and you've got yourself 3,000kcal.
The trick is, plan your meals. When you wake up, start eating. Have your last meal a couple hours before bed. You might even want to slip in an extra drink of milk or juice an hour before bed for the extra dose of energy (provided it won't mess with your sleep). Small meals might include fruit, dried fruit, yoghurt, milk, juice, museli bars, nuts, whatever protein shake/s you might be using, and so forth.