The following is guidance from CEOP (the Child Exploitation and Online Protection centre):
Be involved in your child’s online life
For many of today’s young people there is no line between the online and offline worlds. Young people use the internet to socialise and grow, and just as you guide and support them offline, you should be there for them online too. Talk to them about what they’re doing, if they know you understand they are more likely to approach you if they need support.
Keep up-to-date with your child’s development online
Be inquisitive and interested in the new gadgets and sites that your child is using. It’s important that as your child learns more, so do you.
Set boundaries in the online world just as you would in the real world. Think about what they might see, what they share, who they talk to and how long they spend online. It is important to continue to discuss boundaries so that they evolve as your child’s use of technology does.
Know what connects to the internet and how
Nowadays even the TV connects to the internet. Your child will use all sorts of devices and gadgets; make sure you are aware of which ones can connect to the internet, such as their phone or games console.
Consider the use of parental controls on devices that link to the internet, such as the TV, laptops, computers, games consoles and mobile phones
Parental controls are not just about locking and blocking, they are a tool to help you set appropriate boundaries as your child grows and develops. They are not the answer to your child’s online safety, but they are a good start and are not as difficult to install as you might think.
Emphasise that not everyone is who they say they are
Make sure your child knows never to meet up with someone they only know online. People might not always be who they say they are.
Know what to do if something goes wrong
Just as in the offline world, you want to help your child when they need it. Therefore, it is important to know when and how to report any problem.
Links for “internet safety” advice, guidance & informative videos for parents & carers:
https://www.thinkuknow.co.uk/parents/Primary/
http://www.childnet.com/parents-and-carers