For this:
Register on QForm and add your website
Switch to the design mode, add and configure fields:
To collect contacts, drag the Name and E-mail widgets. Make them mandatory
Go to the Embed Code tab
Copy the DIV to install the form and the script to call it
To place a contact form on a Wordpress site, switch to edit mode for a new or existing page
Click on the + button to add a block.
Select An Arbitrary HTML .