Colleagues

I've followed all the guidance and advice I've been able to find on the web, some of which is confusing and/or contradictory, but I just keep getting the message 'Error Executing Expression: Keystrokes("_tab")'  - I've taken and attach copies of relevant screen shots.  Why does it not work as expected? 

In anticipation of your kind and very much appreciated assistance.

Kindest regards

Ian