I have good knowledge of HTML and CSS, and a little bit of knowledge and experience with PHP, and want to do some pretty simple customization of forms for my constant contact account. I found topics that seem to cover what I'm wanting to do. I will be creating and/or editing some php files somewhere, but the problem is that I don't know where those files are or where they will go. I got an API key for my app, but I have no clue what to do with it to connect to the API or to edit the php.
So, what do I do with my API key (very basic instructions, I know nothing about this), and where are the PHP files?
Thanks for any help
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