If you are online and you discover something that worries you - maybe an inappropriate web page or someone you don't know tries to make contact with you - you should leave the page / chat immediately by clicking on the cross in the top right corner.
You should tell someone about what happened so that hopefully other children will not get scared or worried. You could tell your parents, a member of staff at school or report it to CEOP. CEOP are the internet police and they will help you out and give you advice.
You can get in touch with CEOP here: https://www.ceop.police.uk/safety-centre/
You will have seen our 'Think then Click' posters around school. Try to remember these rules whenever you are online.