Large pictures – Color by Number Make Pixel Art Review

I love the larger pictures separated into 4 parts to color...I am having trouble finding the one last color on each part...it says to long tap...can u clarify those instructions?? LOVE THIS SHOW MUCH I have paid for the premium app Thank You for clarifying the instructions...now when I do as you said I am getting a blank white screen...can you help me again??
Review by snocat_41 on Color by Number Make Pixel Art.