How do you invest in the stock market uk?

I need the basic of the basic stuff here. I don't even have a clue where to go to invest in stock markets in uk or if you do it on line or over the phone. I just need to know how. I don't need tips or what i should be investing in. Also what age can you invest in the stock market?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).