How do you type a Irish fada on computer?

For me, the best thing is to download Fadas5.

This allows you to type a fada by typing the required letter and then hitting a hotkey. In this case the hotkey is (~) which is the key on the top left under (Esc). The great thing about this method is that it only takes two keystrokes to type a letter with a fada and it also types it in the right order, the way you would spell a Word.

You can pin this program to the taskbar or to the start menu, or you can simply open it up and hit 'run' any time you're typing in Irish.