Declining to sign
Nobody has to sign electronically, and saying no is a normal thing to do.
On the signing screen, press the decline link at the bottom.
Give a reason if you want to. It is optional, and it is yours to give or withhold.
Confirm.
You should see
The person who sent it is told. Nobody else is asked to sign, no reminders are sent, and the link stops working.
If it did not work
You declined by mistake. It cannot be undone — ask the sender to send a new one.
You want to sign, just not on a screen. Say so to the sender. They can print it and take a signature the usual way.