Save value to an object list in the page

Hi,

New to appgyer and running into a few basic issues. As seen below in the screenshot, I have a list bound to a page variable object list. This is a list of phone numbers. I want the user to be able to delete a row and as well as input a new phone number to the list.

The input field with the button says not compatible with the object list because it’s an object? How can I input a new number, click save and have it added to the object list?