Yes. Yummywallet is and will remain a free service for its users.
Its very simple
You probably created your account either via facebook or via email and now you are trying to connect with another way. The system inherently prevents the same email to be used by more than one account so if you created an account via facebook, connect via facebook or if you created an account via email, connect via email.
If you have another question contact us at the Contact Us page and we will be quick to post the response.
Thank you for your interest