Do you want to insert a contact form in your Magento 2 site's sidebar so that customers can easily find and contact you? In this tutorial, we'll show you how to do that using Blue Form Builder for Magento 2.
https://www.magezon.com/magento-2-form-builder.html

Supposed that you've already created a contact form using Blue Form Builder.
1. Go to Content > Elements > Widgets[/b]I and click Add New Widget on the top right corner to add a new widget.
2. In [b]Settings section, choose BlueFormBuilder Form type and your Design Theme. Then click Continue button.
3. In Storefront Properties section, enter Widget Title, Assign to Store Views and Sort Order.
4. In Layout Updates section, specify where you want to display your form from Display on drop-down and specify the position from Container drop-down. In this case, you should select Sidebar Main or Sidebar Additional.
5. In Widget Options section, click Select Form button to choose your contact form. You can choose from one of 4 form types: Popup, Inline, Slide-in or Link form and customize settings of each form type.