Mobile friendly websites

[Usher]

I have a website I made a while back, Google keep sending messages that my website is not mobile friendly.
It's made with a WYSIWYG editor & although I have access to alter the code both on the server & in the programme itself I can't seem to grasp how to make the pages fit any size screen.

I've viewed instructions ( & there are lots of enquiries as to how to do this) & cut & pasted the given code into my page header but nothing works

What the heck do I need to put in the page header ?

 

[Usher]

seems overclockers isn't mobile friendly either so perhaps it's not a simple fix?

 

[Usher]

Thanks for your imput guys, seems there are counless numbers of websites that currently don't scale down to mobiles inc Overclockers it seems so I'll leave things as they are for now.
I'll probably do a separate site scaled down with a link from the home page, Googlebot will not recognise it however