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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If I understand you correctly, you want to put a link on your form that redirects to your website.
Please use the "Text" tool in order to insert a link. Highlight the text and then click the "Insert/Edit Link" button. After that, put the URL and then click the "OK" button.
Here's a screencast: