Code appears on website.

Hello, after trying to install and set Breadcrumb NavXT I had so many problems (mostly because I have no idea about code and think I placed the code given in the wrong place.

<div class="breadcrumbs">
    <?php if(function_exists('bcn_display'))
    {
        bcn_display();
    }?>
</div>

Because of the problems I had, I removed the plugin. However, even though disabled and deleted, the following code now shows up at the bottom of a page on my website.

- {
bcn_display();
}?>

I am clueless as to how to remove it as I can not remember where I put the code in the first place. Thank you to anyone who can help. The page effected on my site is Gallery
The problem only shows on my gallery page which is where I was trying to put the code.
Also, again playing around with code when I did not really know what I was doing, I placed some code –

div#shShutter { height: 100%; z-index: 1000; background-color: #FFFFFF; opacity: 0.8; filter:alpha(opacity=80); }

(when trying to change the background colour)into nextgen-gallery/shutter/shutter-reloaded.css. Now that code shows at the top of every page of my admin pages and flicks on and off when I go to my website? How can I remove this. Thanks again in advance for any help.

[Please use the backticks or code buttons when posting code. As is, your code may have been damaged by the parser.]