I have dell laptop which does not have a numberpad, only a set of numbers above the qwerty layout.

I want to be able to control the mouse cursor with my arrow keys.

I activated the mouse keys by going to "System Setting" -> "Universal Access" -> "Pointing and Clicking" and activate "Mouse Keys"

But still, I am unable to control the mouse cursor.

How do I get this going so I don't have to take my hands off the keyboard?