hello

i am a newbie here.

how can I use macrons on 2008 or 2015 Word?

I used to insert a symbol by going to insert, then symbol, and the macrons i wanted to use were there in the chart. Maybe that was before I had a Mac and used my PC. I can't recall.

but i am on Macbook Pro and want to type Romaji - Japanese sounds in English using American English letters.

So, for example, I want to put a dash over a vowel to indicate a long vowel sound. Like a long O (as in doughnut.) To do this in Romaji, i need a dash over the O. How can I do this in Word using my mac. There is no symbol that does it.

thank you so much. I need the help quickly if you can.