Hi Rosie,
Apologies for the delayed response. I will also respond to your email, but thought I would put this here too.
Are you using EPPI-Reviewer 4 or EPPI-Reviewer Web? We have a couple of instructional videos, which would help you with this.
For EPPI-Reviewer 4, please see this video, which introduces double screening.
For EPPI-Reviewer Web, please see this video on data entry modes, double screening and reconciliation.
Please don't hesitate to email us (EPPISupport@ucl.ac.uk) at any time, should you have any further questions.
Kind regards,
Mel
EPPI-Reviewer Support Team