Take another look at the sentence:
Walking in the hot summer sun, Kenny's face dripped sweat.
Walking in the hot summer sun, a participle phrase, comes right before face, an illogical target. [Kenny's, a possessive noun, functions as an adjective describing face.] Unfortunately, faces don't go walking by themselves, without their bodies attached! Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.