From the Dashboard click on your Name and Location.
A drop down list will appear, select Location Admin.
A new page will appear, select the Manage Users tab.
Click on Select a user at this location. A drop down list will appear with a list of users.
Select the user you wish to send Sign up reminders to. This will be any unconfirmed user. Check that the email address is correct, then click Send Signup Reminder.
A pop up will appear at the bottom of the screen, stating 'Email successfully sent'.