Here's how to re-send login details to parents:
Go to 'Centre Settings' > 'Parent Access Control'.
Click on the select all box or select individually if you wish to resend details just for one parent.
Once the selection is made click on 'Email Icons'.
This will trigger emails with log-in details to parents.
After the email is sent, you will see an email icon with a 'green' star next to the email address.
If for any reason, parents do not receive the emails, you can guide them to check the spam/trash or junk folders just in case it got caught there.