Adding Sign-up forms to your emails is a great way to encourage existing customers to invite their friends to sign up; all they need to do is forward the email you send.
First, you need to create the Sign-up form.
Next, head to ‘Communications’ and either create a new email or duplicate a previous one.
Then, write the body of your email, highlight a specific section or word, press the link button and add the URL into the pop-up.
Hit 'Save' and continue as normal. When someone forwards their email to a friend, the recipient will be able to click through to the Sign-up form you created.