In case you want to add more fields to the form, you can manually create custom fields in your Maropost account and then it would automatically show up on step 2 (Design of the Signup form) of the form.

In order to setup a custom field, kindly follow the steps below:

1. Hover the cursor on the (M) logo and click on "Email".

2. Then hover the cursor on "Contacts" and click on "Fields" from the drop-down.

3. On the custom field area, kindly click on "+" sign and a pop-up will appear. 

4. Fill the field name, choose the field type and save it. Rest of the settings are optional.

Once you have set up the custom fields, you can access it inside the forms. 

Click here to know how to create forms and access custom fields inside the form area.