ms word add acute accent to letter

put ALT+769 (at the numpad) sign before (sometimes after)
vowel you wish to mark.

http://masterrussian.net/f13/how-write-cyrillic-letters-acute-sign-example-%D1%85%D0%BE%D0%B4%D0%B8%CC%81%D1%82%D1%8C-17110/