STEP 1 Set up your subscriptions
Before you create a form decide on subscription options. Subscriptions is how your contacts indicate their content preferences. For example newsletter, special offers, surveys, etc. Subscriptions are optional. If you don't have different types of content you don't need to create subscriptions.
STEP 2 Create a new form
STEP3 Customize your form
Click on the form to add/remove fields and update wording.
See this article to customize form styles.
STEP 4 (optional) Add automated emails
If you want to send an automated series of emails to people who fill out the form then you need to create and add these messages to the form. Here's how.
STEP 5 Add the form to your website.
Add the form to any page of your website. You can get the "embed" code from the sidebar of the editor. Read more about form display options.
STEP 6 Test
Test the form to ensure it works as expected.
More form settings
Read more about working with forms such as styles, standard and custom fields, display options, subscriptions, etc.