Take another look at the sentence:
Digging fingernails into his palms, Jerry's speech caused sweatiness and
nervousness.
Digging fingernails into his palms, a participle phrase, is right next to speech, an illogical target. The person, not the speech, has the fingers! [Jerry's, a possessive noun, functions as an adjective describing speech.] Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.