The best time to consume your protein powder can depend on your individual goals and routine. In general though, try to find a place in which you typically don't consume protein in your diet already. This may be after workouts, in between meals, or before bed for example.
That said, the best person to ask about nutrition is a Registered Dietitian. Your R.D. can give you personalized advice based on your goals and your specific protein blend. Thankfully, Gainful gives you unlimited, 1-on-1 access to your very own RD. Simply log in and navigate to the Dietitian tab.