First way: Insert Shortcode to Page
Go to the Forms page
Click on the Insert Shortcode button on the form that you would like to insert into your storefront
Select the page you want to insert the form on
Choose do you want the form to be at the top or at the bottom of the page
You can check your form by going to the storefront and the page where you inserted the form previously.
Second way: Using embedded code
Go to the Forms page
Copy the Form ID of the form you want to show on the store from either
Form ID column by clicking on the link
By clicking on the Grab your embed code button in the Copy column. From there, you can choose and copy the Form ID for OS 2.0 themes (same as doing it like in step a) or the Shortcode for older themes
Go to the Storefront -> Customize theme
Go to the page where you want to add the form
Add a section in which you want to add the form -> Choose Form Builder App
Paste the ID you previously copied into the field predicted for it
Save