I have ads showing on site but I want them to not show on certain pages.

If you simply want to hide it, you can target your advertisements by page module and page controller

example, hide your advertisement on forums

body[data-pagemodule="forums"] #your_advertisement_id{
	display: none;
} 

 

If you want your advertisement not to generate on certain pages then you have to use " Define your own locations  " for your advertisement and manually pasting your advertisement somewhere like in globalTemplate 

example, show your advertisement everywhere but not forums

{{if request.module == 'forums'}}
{{else}}
	{advertisement="KEY"}
{{endif}}

 

How about a way to make it not show in pages but only specific pages?

{{if request.module == 'pages' and request.something = 'mypagename'}} {{else}} {advertisement="KEY"} {{endif}}

almost there?

warp your advertisement in a div 

<div id='adver'>
  
  your advertisement  
  
</div>

and add this to custom.css

body[data-pagemodule="downloads"] #adver{
    display: none;
}

 

How about a way to make it not show in pages but only specific pages?

{{if request.module == 'pages' and request.something = 'mypagename'}} {{else}} {advertisement="KEY"} {{endif}}

almost there?

{{if \IPS\cms\Pages\Page::$currentPage->id == 1}}
	{advertisement="KEY"}
{{endif}}