Really sorry for the confusion. It is *not* possible to make a grid editable for a mobile screen.
Grids on mobile screens are read-only. In the future this may change, but it was not a priority for us when we developed it - reason being, the screen real estate is so limited, that you can only really get two columns across at most, which typically wouldn't handle all the required fields needed for most grids.
Instead, the best thing to do is have a Select link in the grid, populate the fields below, and then a Save & New button. For a mobile interface it gives you more flexibility and can be quite fast.