How do you apply a html piece of coding to all pages?

girl in need

New member
I have a website I run using GoDaddy and already know how to hide the forced banner they apply with free hosting but want to know if it's possible to apply that piece of coding to all my pages. I want to use wordpress and phpBB to run my site and forum now and know it will take a long time to sit there applying a few lines of code to almost 2000 pages. So basically I want to know if there is any piece of coding to put on a new seperate page that will apply the following code to all my pages.

<style>
#conash3D0
{
display:none;
}
</style>
can you explain exactly how to do that? i'm only 13 so thats why...
 
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