You can add a signature block to your ballot.  Here's how:

1) From the side navigation, goto Ballot > Settings  > Ballot Signature tab. 

2) Change the Require an electronic signature on the ballot preview page setting to "Include and require entry of an electronic signature..."  See screen capture below

3) When you select the Include signature an instruction block appears.  You can update the instructions the voter will see regarding the signature block. 

4) Tab the Save Setting button at the bottom of the screen to save this signature setting  

5) To test the signature block, login in as any voter in they election system and cast a ballot. Make sure TESTING MODE is ON.