What is the first step in constructing a congruent segment?

It is to label two points.

Wrong answer! You need to draw a ray first, Here is the official Steps:

Step one: Draw a Ray with endpoint C

Step two: Use the Compass to measure the length of Point A and B

Step three: Use the same compass setting, put the compass point on point C.

Then draw an arc that intersects the ray. THEN Label the points of intersection D.