We recommend slightly unscrewing the screws at the terminals and pushing them down before inserting the wires. Here's a great video showing how to install the wires in the terminals and make them stay put.
It's also important not to force the screws too much, especially when unscrewing them. If they fall out of the screw holes, unfortunately they can't be re-inserted.
If you have any questions about the process or need further assistance, our team will be happy to help!