If someone's interested in joining your team, have a chat with her; either face to face or by phone.
Once she's aware of the Terms and Conditions of joining and is happy to proceed, you can send them a link to join from your Sister App. You can send invites via Facebook, Twitter, What's App or email. You can even provide your recruit with a QR to begin their registration.
Once you've registered her, she'll receive an email notification to complete the sign-up process. Your new recruit will need to follow the steps outlined in the email to complete their registration.
If you have any technical issues setting up your new sponsor, contact email@example.com.