Your account is Momio Lite because you have not given Momio the consent to store any of your personal information. That's why you can only send emojis.
By giving your consent, you can use Momio as usual. If you are under the age of 13, your parents must give consent for you. If you are 13 or older, you can give your own consent.
In both cases, consent is given in the Momio settings, which you will find on your profile by clicking the wheel icon and "Account".