With a free account, you can invite up to 49 participants.
If you have not signed up for a free account you cannot invite participants via email. If you are unable to send email invites, then you do not have a Doodle account or you are not logged in.
Go ahead and log in to your account in order invite up to 49 people.
You can create a free account here: http://doodle.com/signup
Premium Doodle users have a much higher limit of 1000 emails per poll.
Please note that while using the Premium trial version, the limit will also be 49 invites per poll created.
If you need more information or want to try Premium Doodle, please follow this link: