Go to your Sites link in your Netlify account.

Choose the correct website you want to add the forms to.

Then go to your forms link.

Enable forms in this window and then the documentation gives you instructions on what to add to your code for the form to work.

Forms Manage forms and submissions without any server-side code or JavaScript.

Add an HTML form to your site with a netlify attribute in the tag, enable form detection, and you’ll automatically receive form submissions in your Netlify dashboard. Netlify parses HTML forms directly at deploy time, so there’s no need to make an API call or include extra JavaScript on your site.