thin space, default space and protected space

[viveksharma]

The doculment Lyx12.pdf mentions the possibility of using the protected 
space, thin space, default space for say 100\,% or 100\,K;e.g.; and 
Figure~1.3
I am using Lyx 1.3.1 in Cygwin and Lyx 1.33 for Win32 but do not see 
this in the menu for insert>Special Character> ...
This only has the protected blank as a possibility
Can any one advice how to use this functionality
thanks
vivek