If someone has requested you to sign a document remotely, you have the power to Sign or Decline the requested document, as shown below in the image. If you find any error in the requested document, just tap on the Decline option and send a reason to decline to sender. The sender receives a push notification* as well as an email notifying him/her about the reason to decline the signature request.

PS: Request Signature feature is available on app version v4.2.0 and higher, under Business plan.