I am using the Odoo free account online, and in my Point Of Sale, when I click on the top tab "Unknown Customer" I can select the customer and also I can add new customers.

But when I install the Odoo in my own server "Amazon EC2 instance from pragmatic":

https://aws.amazon.com/marketplace/pp/B00KNO9DYW?sr=0-2

I can´t see the button, I cheked the options but  I can´t find the solution.

How can I add the new customer button on my POS?

You can see a screenshot of the button:

https://drive.google.com/file/d/0B9wlMl6ZRS6oWjc1alJobmk2Q0U/edit?usp=sharing

Thanks!