My guest does not received an email, what should i do?

Make sure you have the correct email address entered. If looks right, you can try to resend the invitation to a specific guest. Go to the Invite and manage guests menu, tap Edit in the top right corner, select your guest and tap the Send Invitation button in the bottom left corner. Your guest should receive a new invitation now.

Your guest will be moved to the Pending section until he/she accepts the invitation.