Take another look at the sentence:
Hissing with bursts of hot steam, LeAnn pressed the pants with an iron.
Hissing with bursts of hot steam, a participle phrase, comes right before LeAnn, an illogical target. Irons, not people, hiss with hot steam! Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.