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/