I can't add accent marks on letters ,only on Qt Applications ! i'm using english and greek keyboards layouts

[chris greek <chrisfromgreece%gmail.com@localhost>]

I can't add accent marks on letters ,only on Qt Applications ! , i'm
using english and greek keyboards layouts
I have installed NetBSD and on the installer i had selected us english
by mistake
I can't add accent marks on qt applications like featherpad kate qterminal etc
Where i can add them on gedit firefox libreoffice etc etc

Something has to do with qt ?

For example to add tone/accent on α
i press the ; key and the i press the letter ά