JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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That highly depends on how your website was built. Here's a really detailed guide on which embed codes you should use to put the form on your website: Which-form-embed-code-should-I-use
Give it a try and if that won't suffice, share us the URL of your website/page so we can tell you how to embed it.