The letters inside the shapes need to be rotated somehow to make sense of them.

When you rotate the letters at the top of the puzzle correctly, you'll end up with the phrase "Greetings, Puzzler."

The letters are rotated differently based on which shape they're in.

The letters in the shapes are rotated by the number of sides in the shapes. For example, an "A" inside a triangle would turn into a "D."

After you rotate the letters at the bottom of the puzzle, you get the answer "SHAPESHIFTER."