To create an account you have 2 possibilities:
Go to My account page, REGISTER, enter a valid email address and password.
If you have created an account, you will still need to buy tokens to interact with Eva.
2. You can also create an account on the Buy tokens page, and in this case a password will be automatically generated by the system and you will receive a link by e-mail through which you can change the password.
Open Buy Tokens and add to the shopping cart 
Then press View cart
Press Proceed to Checkout
Fill in the fields e-mail address, country, name, surname, address, city, state, postal code and credit card details and press Place Order button.
After the transaction is confirmed, the credits will be automatically loaded into your account and you can see them in My Tokens.
*** Token consumption may increase if the internet connection is weak, so it is recommended to ensure you have a good internet connection.You can interact with Eva using text or voice. You can also upload a photo taken with the camera and ask Eva to analyze it.
Text. Type the question or request and press the arrow on the right. The message “Gathering thoughts” will appear and it will take a few seconds until Eva gathers her information and answers.

After asking the question, don’t forget to click on the circle to close the microphone and give Eva time to answer.
The message “Gathering thoughts” will appear and it will take a few seconds until Eva gathers her information and answers.
A window will open that allows you to choose the camera or upload a photo from your phone. Press the camera button.
Take a photo and press the Ok button for Eva to upload it. After the photo has loaded in the left side of the microphone, ask Eva by text or voice to analyze the image.
The message “Gathering thoughts” will appear and it will take a few seconds until Eva gathers her information and answers.You have reached your token limit. To use the CHAT, you need to be logged in and purchase tokens.
Check if you are logged into the account, and if not, you must log in. After logging in, check My AI Account if there are credits available in the account. If the credits are 0, you must purchase credits
Nonce vrification failed
The nonce verification failed error message may appear if you have several accounts on the same application, or you log in with a fake or wrong account.
The solution is to clear the cache of the application from Settings/Applications/QUANTEva ChatBot AI/Storage/Empty cache, and then turn off and restart the phone (restart)