The HIPAA Forms Plugin only allows for one signature field at the end of the form. This signature field can be added in the plugin at Settings/Form Setting/Form screen:
For those that need confirmation/agreement/consent at other parts of a form, there is a new advanced field type called "Consent" that was added to V2.4 of Gravity This field allows for checkbox label and a description of the consent agreement. HTML can be included in the consent description. More details here: https://docs.gravityforms.com/consent-field/