Q:

MS Word expression

I am try to make page numbers with IF statement like this
{ IF { PAGE } > 1 "{ PAGE }" "" }

And doing all like here: https://support.microsoft.com/en-us/kb/95886
If more than one page than site numbers will show up.  But i cant make it working when i press CTRL + F9 and type this command its not working. 
Even only { PAGE } not working but when i put this command form menu its working... what i doing wrong??  Why its not working after CTRL + F9.  and Typing PAGE. 
I know that i can preview it by ALT + F9
Sorry for not English Screenshot

BEFORE ALT + F9:

AFTER ALT + F9:

A:

You need to update the field after inserting it outside the header or footer. 
To insert:

Type Alt-F9 to switch on field display
Type Ctrl-F9 to enter field
Type PAGE to enter page field
Type Alt-F9 to shut down field display
Type F9 to update the fields

To manually add DATE:

Type Alt-F9 to switch on field display
Type Ctrl-F9 to enter field
Type DATE to enter date field
Type Space to add extra space, there should be 2 spaces! ( enable display formatting if you want to see the spaces)
Type Alt-F9 to shut down field display
Type F9 to update the fields

As you can see, adding the right number of spaces in the formulas is critical.  By adding the fields through the Ribbon (Insert, Text group, Fields) you can see how Word is creating the fields itself.  If you are familiar with the formatting you can easily type Ctrl-F9 with the formula and update all with F9.