1.) Access the "Right Page Alignment and Postioning" section (the lower section of the dialog box)

2.) Select "Left" in the Horizontal dropdown area

3.) Type a value into the "V:" and/or "H:" fields in that same section

 

I've tried everything I can think of including moving around with tabs but I can't get any commands to work in that part of the dialog box.  I am able to select the "All Pages" dropdown in the "Page" area of the "Attach To" area (the upper section of the frame attributes dialog box), as well as enter/change values in the "Alignment and Positioning" area (the middle section of the dialog box) but nothing in the lower section.

 

It is probably because there are several places in the dialog box where "Horizontal", "V:" and "H:" appear.  The FS documentation says that in such cases a "Neighborhood Specifier" of "Near" must be used.  But I have also tried various possible versions of syntax to accomplish this with no success.  For example, none of the following work: