Shortcode used:
[flexi-form class="pure-form pure-form-stacked" title="My Form" name="my-form" ajax="true" type="url"][flexi-form-tag type="post_title" title="Video Title" value="" placeholder="" required="true"][flexi-form-tag type="category" title="Select Category" id="45"][flexi-form-tag type="video_url" title="Insert oEmbed URL" value="" placeholder="eg. https://www.youtube.com/watch?v=uqyVWtWFQkY" required="true" class="pure-input-1"][flexi-form-tag type="captcha" title="Security"][flexi-form-tag type="submit" name="flexi_submit_button" value="Submit"][/flexi-form]