Hi Alpaslan
Ok for this we need to customize some code in a call-to-action file so please follow the below steps.
1. Go to theme folder consultstreet-pro >> template-parts >> index-cta.php file.
2. Open this file and paste the link code in this file https://pastebin.com/whS15sX6 and save the file.
3. Add the contact form shortcode in the Button Text field.
Let us know if it works.
Thanks