There is a way to send an election-wide reminder to all your voters, as well as a way to send an individual reminder to a single voter.
To send a reminder to a single voter in your election:
In your live (running) election, go to your "Voter List and Status" page.
Search for your voter in the search bar (you can also manually look through your list, but if you already know their email or ballot ID, it's faster to search)
The voter will have a small checkbox next to their ID. Check that box; a drop-down menu should appear:
Select "Send a reminder" from that drop-down list:
5. A window will open, allowing you to edit the reminder, then click "Send".
Not seeing the option to send a reminder? Your election may not qualify for reminders based on the price you paid for your election. Please see our pricing page for more details.